Quartz

Short description: Mineral made of silicon and oxygen

Quartz

Quartz crystal cluster from Brazil

General
Category| Silicate mineral[1]
Formula
(repeating unit)| SiO2
Strunz classification| 4.DA.05 (oxides)
Dana classification| 75.01.03.01 (tectosilicates)
Crystal system| α-quartz: trigonal
β-quartz: hexagonal
Crystal class| α-quartz: trapezohedral (class 3 2)
β-quartz: trapezohedral (class 6 2 2)[2]
Space group| α-quartz: P3221 (no. 154)[3]
β-quartz: P6222 (no. 180) or P6422 (no. 181)[4]
Unit cell| a = 4.9133 Å, c = 5.4053 Å; Z = 3
Identification
Formula mass| 60.083 g·mol−1
Color| Colorless through various colors (pink, orange, purple, dark brown) to black
Crystal habit| 6-sided prism ending in 6-sided pyramid (typical), drusy, fine-grained to microcrystalline, massive
Twinning| Common Dauphine law, Brazil law, and Japan law
Cleavage| {0110} Indistinct
Fracture| Conchoidal
Tenacity| Brittle
Mohs scale hardness| 7 – lower in impure varieties (defining mineral)
|re|er}}| Vitreous – waxy to dull when massive
Streak| White
Diaphaneity| Transparent to nearly opaque
Specific gravity| 2.65; variable 2.59–2.63 in impure varieties
Optical properties| Uniaxial (+)
Refractive index| nω = 1.543–1.545
nε = 1.552–1.554
Birefringence| +0.009 (B-G interval)
Pleochroism| None
Melting point| 1670 °C (β tridymite); 1713 °C (β cristobalite)[2]
Solubility| Insoluble at STP; 1 ppmmass at 400 °C and 500 lb/in2 to 2600 ppmmass at 500 °C and 1500 lb/in2[2]
Other characteristics| Lattice: hexagonal, piezoelectric, may be triboluminescent, chiral (hence optically active if not racemic)
References| [5][6][7][8]

Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is, therefore, usually classified as a framework silicate mineral rather than an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.[10]

Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at 573 °C (846 K; 1,063 °F). Since the transformation is accompanied by a significant change in volume, it can easily induce microfracturing of ceramics or rocks passing through this temperature threshold.

There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and Asia.

Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material to abrasion.

## Contents

* 1 Etymology
* 2 Early studies
* 3 Crystal habit and structure
* 4 Varieties (according to microstructure)
* 5 Varieties (according to color)
* 5.1 Amethyst
* 5.2 Blue quartz
* 5.3 Dumortierite quartz
* 5.4 Citrine
* 5.5 Milky quartz
* 5.6 Rose quartz
* 5.7 Smoky quartz
* 5.8 Prase
* 5.9 Prasiolite
* 6 Piezoelectricity
* 7 Occurrence
* 8 Mining
* 9 Related silica minerals
* 10 Safety
* 11 Synthetic and artificial treatments
* 12 Uses
* 13 See also
* 14 References
* 15 External links

## Etymology

The word "quartz" is derived from the German word Quarz,[11] which had the same form in the first half of the 14th century in Middle High German and in East Central German[12] and which came from the Polish dialect term kwardy, which corresponds to the Czech term tvrdý ("hard").[13] Some sources, however, attribute the word's origin to the Saxon word Querkluftertz, meaning cross-vein ore.[14][15]

The Ancient Greece referred to quartz as κρύσταλλος (Script error: The function "transl" does not exist.) derived from the Ancient Greek κρύος (Script error: The function "transl" does not exist.) meaning "icy cold", because some philosophers (including Theophrastus) understood the mineral to be a form of supercooled ice.[16] Today, the term rock crystal is sometimes used as an alternative name for transparent coarsely crystalline quartz.[17][18]

## Early studies

Roman naturalist Pliny the Elder believed quartz to be water ice, permanently frozen after great lengths of time.[19] He supported this idea by saying that quartz is found near glaciers in the Alps, but not on volcanic mountains, and that large quartz crystals were fashioned into spheres to cool the hands. This idea persisted until at least the 17th century. He also knew of the ability of quartz to split light into a spectrum.[20]

In the 17th century, Nicolas Steno's study of quartz paved the way for modern crystallography. He discovered that regardless of a quartz crystal's size or shape, its long prism faces always joined at a perfect 60° angle.[21]

## Crystal habit and structure

Crystal structure of α-quartz (red balls are oxygen, grey are silicon)

Crystal structure of β-quartz

A chiral pair of α-quartz

Quartz belongs to the trigonal crystal system at room temperature, and to the hexagonal crystal system above 573 °C (846 K; 1,063 °F). The ideal crystal shape is a six-sided prism terminating with six-sided pyramids at each end. In nature quartz crystals are often twinned (with twin right-handed and left-handed quartz crystals), distorted, or so intergrown with adjacent crystals of quartz or other minerals as to only show part of this shape, or to lack obvious crystal faces altogether and appear massive.[22][23]

Well-formed crystals typically form as a druse (a layer of crystals lining a void), of which quartz geodes are particularly fine examples.[24] The crystals are attached at one end to the enclosing rock, and only one termination pyramid is present. However, doubly terminated crystals do occur where they develop freely without attachment, for instance, within gypsum.[25]

α-quartz crystallizes in the trigonal crystal system, space group P3121 or P3221 (space group 152 or 154 resp.) depending on the chirality. Above 573 °C (846 K; 1,063 °F), α-quartz in P3121 becomes the more symmetric hexagonal P6422 (space group 181), and α-quartz in P3221 goes to space group P6222 (no. 180).[26]

These space groups are truly chiral (they each belong to the 11 enantiomorphous pairs). Both α-quartz and β-quartz are examples of chiral crystal structures composed of achiral building blocks (SiO4 tetrahedra in the present case). The transformation between α- and β-quartz only involves a comparatively minor rotation of the tetrahedra with respect to one another, without a change in the way they are linked.[22][27] However, there is a significant change in volume during this transition,[clarification needed] and this can result in significant microfracturing in ceramics[28] and in rocks of the Earth's crust.[29]

* Sceptered quartz

* Sceptered quartz (as aggregates: "Elestial quartz")

* Prismatic quartz with black hematite

* Druse quartz

* Granular quartz

* "Herkimer diamond"

* Twinned quartz

* Massive quartz

## Varieties (according to microstructure)

Although many of the varietal names historically arose from the color of the mineral, current scientific naming schemes refer primarily to the microstructure of the mineral. Color is a secondary identifier for the cryptocrystalline minerals, although it is a primary identifier for the macrocrystalline varieties.[30]

Major varieties of quartz  Type | Color and description | Transparency

|
|

Herkimer diamond | Colorless | Transparent
Rock crystal | Colorless | Transparent
Amethyst | Purple to violet colored quartz | Transparent
Citrine | Yellow quartz ranging to reddish-orange or brown (Madera quartz), and occasionally greenish yellow | Transparent
Ametrine | A mix of amethyst and citrine with hues of purple/violet and yellow or orange/brown | Transparent
Rose quartz | Pink, may display diasterism | Transparent
Chalcedony | Fibrous, variously translucent, cryptocrystalline quartz occurring in many varieties.
The term is often used for white, cloudy, or lightly colored material intergrown with moganite.
Otherwise more specific names are used. |
Carnelian | Reddish orange chalcedony | Translucent
Aventurine | Quartz with tiny aligned inclusions (usually mica) that shimmer with aventurescence | Translucent to opaque
Agate | Multi-colored, curved or concentric banded chalcedony (cf. Onyx) | Semi-translucent to translucent
Onyx | Multi-colored, straight banded chalcedony or chert (cf. Agate) | Semi-translucent to opaque
Jasper | Opaque cryptocrystalline quartz, typically red to brown but often used for other colors | Opaque
Milky quartz | White, may display diasterism | Translucent to opaque
Smoky quartz | Light to dark gray, sometimes with a brownish hue | Translucent to opaque
Tiger's eye | Fibrous gold, red-brown or bluish colored chalcedony, exhibiting chatoyancy. |
Prasiolite | Green | Transparent
Rutilated quartz | Contains acicular (needle-like) inclusions of rutile |
Dumortierite quartz | Contains large amounts of blue dumortierite crystals | Translucent
Prase | Green | Translucent

## Varieties (according to color)

Quartz crystal demonstrating transparency

Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others.[31] These color differentiations arise from the presence of impurities which change the molecular orbitals, causing some electronic transitions to take place in the visible spectrum causing colors.

The most important distinction between types of quartz is that of macrocrystalline (individual crystals visible to the unaided eye) and the microcrystalline or cryptocrystalline varieties (aggregates of crystals visible only under high magnification). The cryptocrystalline varieties are either translucent or mostly opaque, while the transparent varieties tend to be macrocrystalline. Chalcedony is a cryptocrystalline form of silica consisting of fine intergrowths of both quartz, and its monoclinic polymorph moganite.[32] Other opaque gemstone varieties of quartz, or mixed rocks including quartz, often including contrasting bands or patterns of color, are agate, carnelian or sard, onyx, heliotrope, and jasper.[22]

### Amethyst

Rock crystal

Amethyst

Blue quartz

Dumortierite quartz

Citrine quartz (natural)

Citrine quartz (heat-altered amethyst)

Milky quartz

Rose quartz

Smoky quartz

Prase

Amethyst is a form of quartz that ranges from a bright vivid violet to a dark or dull lavender shade. The world's largest deposits of amethysts can be found in Brazil, Mexico, Uruguay, Russia, France, Namibia, and Morocco. Sometimes amethyst and citrine are found growing in the same crystal. It is then referred to as ametrine. Amethyst derives its color from traces of iron in its structure.[33]

### Blue quartz

Blue quartz contains inclusions of fibrous magnesio-riebeckite or crocidolite.[34]

### Dumortierite quartz

Inclusions of the mineral dumortierite within quartz pieces often result in silky-appearing splotches with a blue hue. Shades of purple or grey sometimes also are present. "Dumortierite quartz" (sometimes called "blue quartz") will sometimes feature contrasting light and dark color zones across the material.[35][36] "Blue quartz" is a minor gemstone.[35][37]

### Citrine

Citrine is a variety of quartz whose color ranges from pale yellow to brown due to a submicroscopic distribution of colloidal ferric hydroxide impurities.[38] Natural citrines are rare; most commercial citrines are heat-treated amethysts or smoky quartzes. However, a heat-treated amethyst will have small lines in the crystal, as opposed to a natural citrine's cloudy or smoky appearance. It is nearly impossible to differentiate between cut citrine and yellow topaz visually, but they differ in hardness. Brazil is the leading producer of citrine, with much of its production coming from the state of Rio Grande do Sul. The name is derived from the Latin word citrina which means "yellow" and is also the origin of the word "citron". Sometimes citrine and amethyst can be found together in the same crystal, which is then referred to as ametrine.[39] Citrine has been referred to as the "merchant's stone" or "money stone", due to a superstition that it would bring prosperity.[40]

Citrine was first appreciated as a golden-yellow gemstone in Greece between 300 and 150 BC, during the Hellenistic Age. Yellow quartz was used prior to that to decorate jewelry and tools but it was not highly sought after.[41]

### Milky quartz

Milk quartz or milky quartz is the most common variety of crystalline quartz. The white color is caused by minute fluid inclusions of gas, liquid, or both, trapped during crystal formation,[42] making it of little value for optical and quality gemstone applications.[43]

### Rose quartz

Rose quartz is a type of quartz that exhibits a pale pink to rose red hue. The color is usually considered as due to trace amounts of titanium, iron, or manganese in the material. Some rose quartz contains microscopic rutile needles that produce asterism in transmitted light. Recent X-ray diffraction studies suggest that the color is due to thin microscopic fibers of possibly dumortierite within the quartz.[44]

Additionally, there is a rare type of pink quartz (also frequently called crystalline rose quartz) with color that is thought to be caused by trace amounts of phosphate or aluminium. The color in crystals is apparently photosensitive and subject to fading. The first crystals were found in a pegmatite found near Rumford, Maine, US, and in Minas Gerais, Brazil.[45] The crystals found are more transparent and euhedral, due to the impurities of phosphate and aluminium that formed crystalline rose quartz, unlike the iron and microscopic dumortierite fibers that formed rose quartz.[46]

### Smoky quartz

Smoky quartz is a gray, translucent version of quartz. It ranges in clarity from almost complete transparency to a brownish-gray crystal that is almost opaque. Some can also be black. The translucency results from natural irradiation acting on minute traces of aluminum in the crystal structure.[47]

### Prase

Prase is a green variety of quartz.[48] The green colour is caused by inclusions of amphibole.[49]

### Prasiolite

Prasiolite, also known as vermarine, is a variety of quartz that is green in color.[50] The green is caused by iron ions.[49] It is a rare mineral in nature and is typically found with amethyst; most "prasiolite" is not natural – it has been artificially produced by heating of amethyst. Since 1950[citation needed], almost all natural prasiolite has come from a small Brazil ian mine, but it is also seen in Lower Silesia in Poland . Naturally occurring prasiolite is also found in the Thunder Bay area of Canada .[50]

## Piezoelectricity

Quartz crystals have piezoelectric properties; they develop an electric potential upon the application of mechanical stress.[51] Quartz's piezoelectric properties were discovered by Jacques and Pierre Curie in 1880.[52][53]

## Occurrence

Granite rock in the cliff of Gros la Tête on Aride Island, Seychelles. The thin (1–3 cm wide) brighter layers are quartz veins, formed during the late stages of crystallization of granitic magmas. They are sometimes called "hydrothermal veins".

Quartz is a defining constituent of granite and other felsic igneous rocks. It is very common in sedimentary rocks such as sandstone and shale. It is a common constituent of schist, gneiss, quartzite and other metamorphic rocks.[22] Quartz has the lowest potential for weathering in the Goldich dissolution series and consequently it is very common as a residual mineral in stream sediments and residual soils. Generally a high presence of quartz suggests a "mature" rock, since it indicates the rock has been heavily reworked and quartz was the primary mineral that endured heavy weathering.[54]

While the majority of quartz crystallizes from molten magma, quartz also chemically precipitates from hot hydrothermal veins as gangue, sometimes with ore minerals like gold, silver and copper. Large crystals of quartz are found in magmatic pegmatites.[22] Well-formed crystals may reach several meters in length and weigh hundreds of kilograms.[55]

The largest documented single crystal of quartz was found near Itapore, Goiaz, Brazil; it measured approximately 6.1 m × 1.5 m × 1.5 m and weighed 39,916 kilograms.[56]

## Mining

Quartz is extracted from open pit mines. Miners occasionally use explosives to expose deep pockets of quartz. More frequently, bulldozers and backhoes are used to remove soil and clay and expose quartz veins, which are then worked using hand tools. Care must be taken to avoid sudden temperature changes that may damage the crystals.[57][58]

## Related silica minerals

Tridymite and cristobalite are high-temperature polymorphs of SiO2 that occur in high-silica volcanic rocks. Coesite is a denser polymorph of SiO2 found in some meteorite impact sites and in metamorphic rocks formed at pressures greater than those typical of the Earth's crust. Stishovite is a yet denser and higher-pressure polymorph of SiO2 found in some meteorite impact sites.[59] Moganite is a monoclinic polymorph. Lechatelierite is an amorphous silica glass SiO2 which is formed by lightning strikes in quartz sand.[60]

## Safety

As quartz is a form of silica, it is a possible cause for concern in various workplaces. Cutting, grinding, chipping, sanding, drilling, and polishing natural and manufactured stone products can release hazardous levels of very small, crystalline silica dust particles into the air that workers breathe.[61] Crystalline silica of respirable size is a recognized human carcinogen and may lead to other diseases of the lungs such as silicosis and pulmonary fibrosis.[62][63]

## Synthetic and artificial treatments

A synthetic quartz crystal grown by the hydrothermal method, about 19 centimetres (7.5 in) long and weighing about 127 grams (4.5 oz)

Not all varieties of quartz are naturally occurring. Some clear quartz crystals can be treated using heat or gamma-irradiation to induce color where it would not otherwise have occurred naturally. Susceptibility to such treatments depends on the location from which the quartz was mined.[64]

Prasiolite, an olive colored material, is produced by heat treatment;[65] natural prasiolite has also been observed in Lower Silesia in Poland.[66] Although citrine occurs naturally, the majority is the result of heat-treating amethyst or smoky quartz.[65] Carnelian has been heat-treated to deepen its color since prehistoric times.[67]

Because natural quartz is often twinned, synthetic quartz is produced for use in industry. Large, flawless, single crystals are synthesized in an autoclave via the hydrothermal process.[68][22][69]

Like other crystals, quartz may be coated with metal vapors to give it an attractive sheen.[70][71]

## Uses

Quartz is the most common material identified as the mystical substance maban in Australian Aboriginal mythology. It is found regularly in passage tomb cemeteries in Europe in a burial context, such as Newgrange or Carrowmore in Ireland. Quartz was also used in Prehistoric Ireland, as well as many other countries, for stone tools; both vein quartz and rock crystal were knapped as part of the lithic technology of the prehistoric peoples.[72]

While jade has been since earliest times the most prized semi-precious stone for carving in East Asia and Pre-Columbian America, in Europe and the Middle East the different varieties of quartz were the most commonly used for the various types of jewelry and hardstone carving, including engraved gems and cameo gems, rock crystal vases, and extravagant vessels. The tradition continued to produce objects that were very highly valued until the mid-19th century, when it largely fell from fashion except in jewelry. Cameo technique exploits the bands of color in onyx and other varieties.

Efforts to synthesize quartz began in the mid-nineteenth century as scientists attempted to create minerals under laboratory conditions that mimicked the conditions in which the minerals formed in nature: German geologist Karl Emil von Schafhäutl (1803–1890) was the first person to synthesize quartz when in 1845 he created microscopic quartz crystals in a pressure cooker.[73] However, the quality and size of the crystals that were produced by these early efforts were poor.[74]

Elemental impurity incorporation strongly influences the ability to process and utilize quartz. Naturally occurring quartz crystals of extremely high purity, necessary for the crucibles and other equipment used for growing silicon wafers in the semiconductor industry, are expensive and rare. These high-purity quartz are defined as containing less than 50 ppm of impurity elements.[75] A major mining location for high purity quartz is the Spruce Pine Gem Mine in Spruce Pine, North Carolina, United States.[76] Quartz may also be found in Caldoveiro Peak, in Asturias, Spain.[77]

By the 1930s, the electronics industry had become dependent on quartz crystals. The only source of suitable crystals was Brazil; however, World War II disrupted the supplies from Brazil, so nations attempted to synthesize quartz on a commercial scale. German mineralogist Richard Nacken (1884–1971) achieved some success during the 1930s and 1940s.[78] After the war, many laboratories attempted to grow large quartz crystals. In the United States, the U.S. Army Signal Corps contracted with Bell Laboratories and with the Brush Development Company of Cleveland, Ohio to synthesize crystals following Nacken's lead.[79][80] (Prior to World War II, Brush Development produced piezoelectric crystals for record players.) By 1948, Brush Development had grown crystals that were 1.5 inches (3.8 cm) in diameter, the largest at that time.[81][82] By the 1950s, hydrothermal synthesis techniques were producing synthetic quartz crystals on an industrial scale, and today virtually all the quartz crystal used in the modern electronics industry is synthetic.[69]

An early use of the piezoelectricity of quartz crystals was in phonograph pickups. One of the most common piezoelectric uses of quartz today is as a crystal oscillator. The quartz oscillator or resonator was first developed by Walter Guyton Cady in 1921.[83][84] George Washington Pierce designed and patented quartz crystal oscillators in 1923.[85][86][87] The quartz clock is a familiar device using the mineral. Warren Marrison created the first quartz oscillator clock based on the work of Cady and Pierce in 1927.[88] The resonant frequency of a quartz crystal oscillator is changed by mechanically loading it, and this principle is used for very accurate measurements of very small mass changes in the quartz crystal microbalance and in thin-film thickness monitors.[89]

* Rock crystal jug with cut festoon decoration by Milan workshop from the second half of the 16th century, National Museum in Warsaw. The city of Milan, apart from Prague and Florence, was the main Renaissance centre for crystal cutting.[90]

* Synthetic quartz crystals produced in the autoclave shown in Western Electric's pilot hydrothermal quartz plant in 1959

* Fatimid ewer in carved rock crystal (clear quartz) with gold lid, c. 1000

Almost all the industrial demand for quartz crystal (used primarily in electronics) is met with synthetic quartz produced by the hydrothermal process. However, synthetic crystals are less prized for use as gemstones.[91] The popularity of crystal healing has increased the demand for natural quartz crystals, which are now often mined in developing countries using primitive mining methods, sometimes involving child labor.[92]

## See also

* Fused quartz
* List of minerals
* Quartz fiber
* Quartz reef mining
* Quartzolite
* Shocked quartz

## References

1. ↑ "Quartz". A Dictionary of Geology and Earth Sciences. Oxford University Press. 19 September 2013. ISBN 978-0-19-965306-5. https://www.oxfordreference.com/view/10.1093/acref/9780199653065.001.0001/acref-9780199653065-e-6907.
2. ↑ 2.0 2.1 2.2 Deer, W. A.; Howie, R.A.; Zussman, J. (1966). An introduction to the rock-forming minerals. New York: Wiley. pp. 340–355. ISBN 0-582-44210-9.
3. ↑ Antao, S. M.; Hassan, I.; Wang, J.; Lee, P. L.; Toby, B. H. (1 December 2008). "State-Of-The-Art High-Resolution Powder X-Ray Diffraction (HRPXRD) Illustrated with Rietveld Structure Refinement of Quartz, Sodalite, Tremolite, and Meionite". The Canadian Mineralogist 46 (6): 1501–1509. doi:10.3749/canmin.46.5.1501.
4. ↑ Kihara, K. (1990). "An X-ray study of the temperature dependence of the quartz structure". European Journal of Mineralogy 2 (1): 63–77. doi:10.1127/ejm/2/1/0063. Bibcode: 1990EJMin...2...63K.
5. ↑ Quartz . Mindat.org. Retrieved 2013-03-07.
6. ↑ "Quartz". Handbook of Mineralogy. III (Halides, Hydroxides, Oxides). Chantilly, VA: Mineralogical Society of America. 29 January 1990. ISBN 0962209724. http://rruff.geo.arizona.edu/doclib/hom/quartz.pdf. Retrieved 21 October 2009.
7. ↑ Quartz . Webmineral.com. Retrieved 2013-03-07.
8. ↑ Hurlbut, Cornelius S.; Klein, Cornelis (1985). Manual of Mineralogy (20 ed.). Wiley. ISBN 0-471-80580-7. https://archive.org/details/manualofmineralo00klei.
9. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
10. ↑ Anderson, Robert S.; Anderson, Suzanne P. (2010). Geomorphology: The Mechanics and Chemistry of Landscapes. Cambridge University Press. p. 187. ISBN 978-1-139-78870-0. https://books.google.com/books?id=hDt5A2-km_wC.
11. ↑ "Quartz". Merriam-Webster.com Dictionary. https://www.merriam-webster.com/dictionary/quartz.
12. ↑ Digitales Wörterbuch der deutschen Sprache (in German)
13. ↑ "Quartz | Definition of quartz by Lexico". https://en.oxforddictionaries.com/definition/quartz.
14. ↑ Mineral Atlas , Queensland University of Technology. Mineralatlas.com. Retrieved 2013-03-07.
15. ↑ Tomkeieff, S.I. (1942). "On the origin of the name 'quartz'". Mineralogical Magazine 26 (176): 172–178. doi:10.1180/minmag.1942.026.176.04. Bibcode: 1942MinM...26..172T.
16. ↑ Tomkeieff, S.I. (1942). "On the origin of the name 'quartz'". Mineralogical Magazine 26 (176): 172–178. doi:10.1180/minmag.1942.026.176.04. Bibcode: 1942MinM...26..172T. http://www.minersoc.org/pages/Archive-MM/Volume_26/26-176-172.pdf. Retrieved 12 August 2015.
17. ↑ Morgado, Antonio; Lozano, José Antonio; García Sanjuán, Leonardo; Triviño, Miriam Luciañez; Odriozola, Carlos P.; Irisarri, Daniel Lamarca; Flores, Álvaro Fernández (December 2016). "The allure of rock crystal in Copper Age southern Iberia: Technical skill and distinguished objects from Valencina de la Concepción (Seville, Spain)". Quaternary International 424: 232–249. doi:10.1016/j.quaint.2015.08.004. Bibcode: 2016QuInt.424..232M.
18. ↑ Nesse, William D. (2000). Introduction to mineralogy. New York: Oxford University Press. p. 205. ISBN 9780195106916.
19. ↑ Pliny the Elder, The Natural History, Book 37, Chapter 9. Available on-line at: Perseus.Tufts.edu .
20. ↑ Tutton, A.E. (1910). "Rock crystal: its structure and uses". RSA Journal 59: 1091.
21. ↑ Nicolaus Steno (Latinized name of Niels Steensen) with John Garrett Winter, trans., The Prodromus of Nicolaus Steno's Dissertation Concerning a Solid Body Enclosed by Process of Nature Within a Solid (New York, New York: Macmillan Co., 1916). On page 272 , Steno states his law of constancy of interfacial angles: "Figures 5 and 6 belong to the class of those which I could present in countless numbers to prove that in the plane of the axis both the number and the length of the sides are changed in various ways without changing the angles; … "
22. ↑ 22.0 22.1 22.2 22.3 22.4 22.5 Hurlbut & Klein 1985.
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24. ↑ Sinkankas, John (1964). Mineralogy for amateurs.. Princeton, N.J.: Van Nostrand. pp. 443–447. ISBN 0442276249.
25. ↑ Tarr, W. A (1929). "Doubly terminated quartz crystals occurring in gypsum". American Mineralogist 14 (1): 19–25. https://pubs.geoscienceworld.org/msa/ammin/article-abstract/14/1/19/535468. Retrieved 7 April 2021.
26. ↑ Crystal Data, Determinative Tables, ACA Monograph No. 5, American Crystallographic Association, 1963
27. ↑ Nesse 2000, p. 201.
28. ↑ Knapek, Michal; Húlan, Tomáš; Minárik, Peter; Dobroň, Patrik; Štubňa, Igor; Stráská, Jitka; Chmelík, František (January 2016). "Study of microcracking in illite-based ceramics during firing". Journal of the European Ceramic Society 36 (1): 221–226. doi:10.1016/j.jeurceramsoc.2015.09.004.
29. ↑ Johnson, Scott E.; Song, Won Joon; Cook, Alden C.; Vel, Senthil S.; Gerbi, Christopher C. (January 2021). "The quartz α↔β phase transition: Does it drive damage and reaction in continental crust?". Earth and Planetary Science Letters 553: 116622. doi:10.1016/j.epsl.2020.116622. Bibcode: 2021E&PSL.55316622J.
30. ↑ "Quartz Gemstone and Jewelry Information: Natural Quartz – GemSelect". https://www.gemselect.com/gem-info/quartz/quartz-info.php.
31. ↑ "Quartz: The gemstone Quartz information and pictures" (in en-US). http://www.minerals.net/gemstone/quartz_gemstone.aspx.
32. ↑ Heaney, Peter J. (1994). "Structure and Chemistry of the low-pressure silica polymorphs". Reviews in Mineralogy and Geochemistry 29 (1): 1–40. http://rimg.geoscienceworld.org/cgi/content/abstract/29/1/1. Retrieved 26 October 2009.
33. ↑ Lehmann, G.; Moore, W. J. (20 May 1966). "Color Center in Amethyst Quartz". Science 152 (3725): 1061–1062. doi:10.1126/science.152.3725.1061. PMID 17754816. Bibcode: 1966Sci...152.1061L.
34. ↑ "Blue Quartz". Mindat.org. https://www.mindat.org/min-26723.html.
35. ↑ 35.0 35.1 Oldershaw, Cally (2003). Firefly Guide to Gems. Firefly Books. pp. 100. ISBN 9781552978146. https://archive.org/details/fireflyguidetoge0000olde. Retrieved 19 February 2017.
36. ↑ "The Gemstone Dumortierite". Minerals.net. http://www.minerals.net/gemstone/dumortierite_gemstone.aspx.
37. ↑ Friedman, Herschel. "THE GEMSTONE DUMORTIERITE". https://www.minerals.net/gemstone/dumortierite_gemstone.aspx.
38. ↑ Deer, Howie & Zussman 1966, p. 350.
39. ↑ Citrine . Mindat.org (2013-03-01). Retrieved 2013-03-07.
40. ↑ Webster, Richard (8 September 2012). The Encyclopedia of Superstitions. p. 59. ISBN 9780738725611. https://books.google.com/books?id=m1-xCL47_7QC&q=citrine&pg=PA59.
41. ↑ "Citrine Meaning". 7 January 2016. http://thehealingchest.com/crystals-stones/citrine-meaning/.
42. ↑ Hurrell, Karen; Johnson, Mary L. (2016). Gemstones: A Complete Color Reference for Precious and Semiprecious Stones of the World. Book Sales. p. 97. ISBN 978-0-7858-3498-4. https://books.google.com/books?id=KLSTDgAAQBAJ&pg=PA97.
43. ↑ Milky quartz at Mineral Galleries . Galleries.com. Retrieved 2013-03-07.
44. ↑ "Rose Quartz". http://www.mindat.org/show.php?id=3456.
45. ↑ "Quartz and its colored varieties". California Institute of Technology. http://minerals.caltech.edu/ge114/Lecture_Topics/Quartz/Index.htm.
46. ↑ "Pink Quartz". http://www.quartzpage.de/pink.html.
47. ↑ Fridrichová, Jana; Bačík, Peter; Illášová, Ľudmila; Kozáková, Petra; Škoda, Radek; Pulišová, Zuzana; Fiala, Anton (July 2016). "Raman and optical spectroscopic investigation of gem-quality smoky quartz crystals". Vibrational Spectroscopy 85: 71–78. doi:10.1016/j.vibspec.2016.03.028.
48. ↑ "Prase". mindat.org. https://www.mindat.org/min-6703.html. Retrieved 4 April 2023.
49. ↑ 49.0 49.1 Klemme, S.; Berndt, J.; Mavrogonatos, C.; Flemetakis, S.; Baziotis, I.; Voudouris, P.; Xydous, S. (2018). "On the Color and Genesis of Prase (Green Quartz) and Amethyst from the Island of Serifos, Cyclades, Greece". Minerals 8 (11): 487. doi:10.3390/min8110487. Bibcode: 2018Mine....8..487K.
50. ↑ 50.0 50.1 "Prasiolite". quarzpage.de. 28 October 2009. http://www.quartzpage.de/prasiolite.html.
51. ↑ Uchino, Kenji, ed (2017). "Chapter 5 – Quartz-Based Piezoelectric Materials". Advanced Piezoelectric Materials. Woodhead Publishing in Materials (2nd ed.). Woodhead Publishing. pp. 197–233. doi:10.1016/B978-0-08-102135-4.00005-9. ISBN 9780081021354.
52. ↑ Curie, Jacques; Curie, Pierre (1880). "Développement par compression de l'électricité polaire dans les cristaux hémièdres à faces inclinées". Bulletin de la Société minéralogique de France 3 (4): 90–93. doi:10.3406/bulmi.1880.1564. https://babel.hathitrust.org/cgi/pt?id=uc1.b3616891&view=1up&seq=100. . Reprinted in: Curie, Jacques; Curie, Pierre (1880). "Développement, par pression, de l'électricité polaire dans les cristaux hémièdres à faces inclinées". Comptes rendus 91: 294–295. http://gallica.bnf.fr/ark:/12148/bpt6k30485/f296.image. Retrieved 17 December 2013.
53. ↑ Curie, Jacques; Curie, Pierre (1880). "Sur l'électricité polaire dans les cristaux hémièdres à faces inclinées". Comptes rendus 91: 383–386. http://gallica.bnf.fr/ark:/12148/bpt6k30485/f385.image. Retrieved 17 December 2013.
54. ↑ Boggs, Sam (2006). Principles of sedimentology and stratigraphy (4th ed.). Upper Saddle River, N.J.: Pearson Prentice Hall. p. 130. ISBN 0131547283.
55. ↑ Jahns, Richard H. (1953). "The genesis of pegmatites: I. Occurrence and origin of giant crystals". American Mineralogist 38 (7–8): 563–598. https://pubs.geoscienceworld.org/msa/ammin/article-abstract/38/7-8/563/539244. Retrieved 7 April 2021.
56. ↑ Rickwood, P. C. (1981). "The largest crystals". American Mineralogist 66: 885–907 (903). http://www.minsocam.org/ammin/AM66/AM66_885.pdf. Retrieved 7 March 2013.
57. ↑ McMillen, Allen. "Quartz Mining". Central Arkansas Library System. https://encyclopediaofarkansas.net/entries/quartz-mining-1173/.
58. ↑ Eleanor McKenzie (25 April 2017). "How Is Quartz Extracted?". https://sciencing.com/quartz-extracted-8700692.html.
59. ↑ Nesse 2000, pp. 201-202.
60. ↑ "Lechatelierite". https://www.mindat.org/min-2363.html.
61. ↑ Hazard Alert - Worker Exposure to Silica during Countertop Manufacturing, Finishing and Installation. DHHS (NIOSH). p. 2. https://www.osha.gov/Publications/OSHA3768.pdf. Retrieved 27 November 2019.
62. ↑ "Silica (crystalline, respirable)". California Office of Environmental Health Hazard Assessment. https://oehha.ca.gov/chemicals/silica-crystalline-respirable.
63. ↑ Arsenic, Metals, Fibres and Dusts. A Review of Human Carcinogens (100C ed.). International Agency for Research on Cancer. 2012. pp. 355–397. ISBN 978-92-832-1320-8. https://www.ncbi.nlm.nih.gov/books/NBK304375/pdf/Bookshelf_NBK304375.pdf. Retrieved 27 November 2019.
64. ↑ Liccini, Mark, Treating Quartz to Create Color , International Gem Society website. Retrieved 22 December 2014
65. ↑ 65.0 65.1 Henn, U.; Schultz-Güttler, R. (2012). "Review of some current coloured quartz varieties". J. Gemmol 33: 29–43. doi:10.15506/JoG.2012.33.1.29. https://gem-a.com/images/Documents/JoG/JoG2012_33_1-4.pdf#page=31. Retrieved 7 April 2021.
66. ↑ Platonov, Alexej N.; Szuszkiewicz, Adam (1 June 2015). "Green to blue-green quartz from Rakowice Wielkie (Sudetes, south-western Poland) – a re-examination of prasiolite-related color varieties of quartz". Mineralogia 46 (1–2): 19–28. doi:10.1515/mipo-2016-0004. Bibcode: 2015Miner..46...19P.
67. ↑ Groman-Yaroslavski, Iris; Bar-Yosef Mayer, Daniella E. (June 2015). "Lapidary technology revealed by functional analysis of carnelian beads from the early Neolithic site of Nahal Hemar Cave, southern Levant". Journal of Archaeological Science 58: 77–88. doi:10.1016/j.jas.2015.03.030. Bibcode: 2015JArSc..58...77G.
68. ↑ Walker, A. C. (August 1953). "Hydrothermal Synthesis of Quartz Crystals". Journal of the American Ceramic Society 36 (8): 250–256. doi:10.1111/j.1151-2916.1953.tb12877.x.
69. ↑ 69.0 69.1 Buisson, X.; Arnaud, R. (February 1994). "Hydrothermal growth of quartz crystals in industry. Present status and evolution". Le Journal de Physique IV 04 (C2): C2–25–C2-32. doi:10.1051/jp4:1994204. https://hal.archives-ouvertes.fr/jpa-00252472/file/ajp-jp4199404C204.pdf.
70. ↑ Robert Webster, Michael O'Donoghue (January 2006). Gems: Their Sources, Descriptions and Identification. Butterworth-Heinemann. ISBN 9780750658560. https://books.google.com/books?id=ZwcM5H-wHNoC&q=""2aqua+aura""2+-healing&pg=PT28.
71. ↑ "How is Aura Rainbow Quartz Made?". 2017. http://www.geologyin.com/2017/06/how-is-aura-rainbow-quartz-made.html.
72. ↑ "Driscoll, Killian. 2010. Understanding quartz technology in early prehistoric Ireland". http://www.lithicsireland.ie/phd_quartz_lithic_technology_chap_3.html.
73. ↑ von Schafhäutl, Karl Emil (10 April 1845). "Die neuesten geologischen Hypothesen und ihr Verhältniß zur Naturwissenschaft überhaupt (Fortsetzung)". Gelehrte Anzeigen (München: im Verlage der königlichen Akademie der Wissenschaften, in Commission der Franz'schen Buchhandlung) 20 (72): 577–584. OCLC 1478717. https://archive.org/stream/gelehrteanzeige06wissgoog#page/n298/mode/1up. From page 578: 5) Bildeten sich aus Wasser, in welchen ich im Papinianischen Topfe frisch gefällte Kieselsäure aufgelöst hatte, beym Verdampfen schon nach 8 Tagen Krystalle, die zwar mikroscopisch, aber sehr wohl erkenntlich aus sechseitigen Prismen mit derselben gewöhnlichen Pyramide bestanden. ( 5) There formed from water in which I had dissolved freshly precipitated silicic acid in a Papin pot [i.e., pressure cooker], after just 8 days of evaporating, crystals, which albeit were microscopic but consisted of very easily recognizable six-sided prisms with their usual pyramids.)
74. ↑ Byrappa, K. and Yoshimura, Masahiro (2001) Handbook of Hydrothermal Technology. Norwich, New York: Noyes Publications. ISBN:008094681X. Chapter 2: History of Hydrothermal Technology.
75. ↑ Götze, Jens; Pan, Yuanming; Müller, Axel (October 2021). "Mineralogy and mineral chemistry of quartz: A review" (in en). Mineralogical Magazine 85 (5): 639–664. doi:10.1180/mgm.2021.72. ISSN 0026-461X. Bibcode: 2021MinM...85..639G.
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77. ↑ "Caldoveiro Mine, Tameza, Asturias, Spain". mindat.org. https://www.mindat.org/loc-122679.html.
78. ↑ Nacken, R. (1950) "Hydrothermal Synthese als Grundlage für Züchtung von Quarz-Kristallen" (Hydrothermal synthesis as a basis for the production of quartz crystals), Chemiker Zeitung, 74 : 745–749.
79. ↑ Hale, D. R. (1948). "The Laboratory Growing of Quartz". Science 107 (2781): 393–394. doi:10.1126/science.107.2781.393. PMID 17783928. Bibcode: 1948Sci...107..393H.
80. ↑ Lombardi, M. (2011). "The evolution of time measurement, Part 2: Quartz clocks [Recalibration"]. IEEE Instrumentation & Measurement Magazine 14 (5): 41–48. doi:10.1109/MIM.2011.6041381. http://tf.nist.gov/general/pdf/2534.pdf. Retrieved 30 March 2013.
81. ↑ "Record crystal", Popular Science, 154 (2) : 148 (February 1949).
82. ↑ Brush Development's team of scientists included: Danforth R. Hale, Andrew R. Sobek, and Charles Baldwin Sawyer (1895–1964). The company's U.S. patents included:
* Sobek, Andrew R. "Apparatus for growing single crystals of quartz", U.S. Patent 2,674,520; filed: 11 April 1950; issued: 6 April 1954.
* Sobek, Andrew R. and Hale, Danforth R. "Method and apparatus for growing single crystals of quartz", U.S. Patent 2,675,303; filed: 11 April 1950; issued: 13 April 1954.
* Sawyer, Charles B. "Production of artificial crystals", U.S. Patent 3,013,867; filed: 27 March 1959; issued: 19 December 1961. (This patent was assigned to Sawyer Research Products of Eastlake, Ohio.)
83. ↑ Cady, W. G. (1921). "The piezoelectric resonator". Physical Review 17: 531–533. doi:10.1103/PhysRev.17.508. https://zenodo.org/record/2523161.
84. ↑ "The Quartz Watch – Walter Guyton Cady". The Lemelson Center, National Museum of American History, Smithsonian Institution. http://invention.smithsonian.org/centerpieces/quartz/inventors/cady.html.
85. ↑ Pierce, G. W. (1923). "Piezoelectric crystal resonators and crystal oscillators applied to the precision calibration of wavemeters". Proceedings of the American Academy of Arts and Sciences 59 (4): 81–106. doi:10.2307/20026061.
86. ↑ Pierce, George W. "Electrical system", U.S. Patent 2,133,642, filed: 25 February 1924; issued: 18 October 1938.
87. ↑ "The Quartz Watch – George Washington Pierce". The Lemelson Center, National Museum of American History, Smithsonian Institution. http://invention.smithsonian.org/centerpieces/quartz/inventors/pierce.html.
88. ↑ "The Quartz Watch – Warren Marrison". The Lemelson Center, National Museum of American History, Smithsonian Institution. http://invention.smithsonian.org/centerpieces/quartz/inventors/clock.html.
89. ↑ "Verwendung von Schwingquarzen zur Wägung dünner Schichten und zur Mikrowägung" (in de). Zeitschrift für Physik (Springer-Verlag) 155 (2): 206–222. April 1959. doi:10.1007/BF01337937. ISSN 0044-3328. Bibcode: 1959ZPhy..155..206S. http://jmfriedt.sequanux.org/t/sauerbrey.pdf. Retrieved 2019-02-26. (NB. This was partially presented at Physikertagung in Heidelberg in October 1957.)
90. ↑ The International Antiques Yearbook. Studio Vista Limited. 1972. p. 78. https://books.google.com/books?id=BVcvAQAAIAAJ. "Apart from Prague and Florence, the main Renaissance centre for crystal cutting was Milan."
91. ↑ "Hydrothermal Quartz". GemSelect.com. https://www.gemselect.com/other-info/synthetic-quartz.php.
92. ↑ McClure, Tess (2019-09-17). "Dark crystals: the brutal reality behind a booming wellness craze" (in en-GB). The Guardian. ISSN 0261-3077. https://www.theguardian.com/lifeandstyle/2019/sep/17/healing-crystals-wellness-mining-madagascar.

## External links

| Look up quartz in Wiktionary, the free dictionary.

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* Quartz varieties, properties, crystal morphology. Photos and illustrations
* Gilbert Hart, "Nomenclature of Silica", American Mineralogist, Volume 12, pp. 383–395. 1927
* "The Quartz Watch – Inventors". The Lemelson Center, National Museum of American History, Smithsonian Institution. http://invention.smithsonian.org/centerpieces/quartz/inventors/index.html.
* Terminology used to describe the characteristics of quartz crystals when used as oscillators
* Quartz use as prehistoric stone tool raw material

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