Strengite

A small crystal of Strengite

General
Category| Mineral
Formula
(repeating unit)| FePO4·2H2O
Strunz classification| 8.CD.10
Dana classification| 40.04.01.02
Crystal system| Orthorhombic
Crystal class| Dipyramidal (mmm)
H-M Symbol: (2/m 2/m 2/m)
Space group| Pcab
Identification
Formula mass| 186.85 g/mol
Color| Colorless, pale violet, deep violet, red, carmine red, greenish white
Crystal habit| Botryoidal, radial, spherical
Cleavage| {010} Good, {001} Poor
Mohs scale hardness| 3.5–4
|re|er}}| Vitreous
Streak| White
Diaphaneity| Transparent to translucent
Specific gravity| 2.84
Density| 2.87 g/cm3
Optical properties| Biaxial (+)
2V angle| 72° – 88°
Dispersion| r < v, relatively strong
References| [1][2][3]

Strengite is a relatively rare iron phosphate mineral with the formula: FePO4·2H2O.[5] The mineral is named after the German mineralogist Johann August Streng (1830-1897).[6] Lavender, pink or purple in hue, it is similar to variscite[7] and is partially soluble, particularly in conditions where there is a low pH and low oxidation-reduction potential.[5] The color comes from ferric ion (Fe3+).[8]

## References

1. ↑ "Strengite Mineral Data". Webmineral.com. http://webmineral.com/data/Strengite.shtml.
2. ↑ "Strengite mineral information and data". Mindat.org. http://www.mindat.org/min-3801.html.
3. ↑ "STRENGITE (Hydrated Iron Phosphate)". http://www.galleries.com/Strengite.
4. ↑ 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.
5. ↑ 5.0 5.1 Patrick, W. H. Jr.; Gotoh, S.; Williams, B. G. (February 9, 1973), "Strengite Dissolution in Flooded Soils and Sediments", Science 179 (4073): 564–565, doi:10.1126/science.179.4073.564, PMID 17820817, Bibcode: 1973Sci...179..564P
6. ↑ Senning, Alexander (2007), Elsevier's dictionary of chemoetymology: the whies and whences of chemical nomenclature and terminology, Elsevier, p. 374, ISBN 978-0-444-52239-9, https://books.google.com/books?id=Fl4sdCYrq3cC&pg=PA374
7. ↑ Pough, Frederick H.; Peterson, Roger Tory (1997), A Field Guide to Rocks and Minerals, Peterson Field Guide, 7 (5th ed.), Houghton Mifflin Harcourt, p. 239, ISBN 0-395-91096-X, https://books.google.com/books?id=C-7APnYVG04C&pg=PA239
8. ↑ "Minerals Colored by Metal Ions". http://minerals.gps.caltech.edu/color_causes/Metal_Ion/index.html.

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Phosphate minerals

Crystalline|

* Beraunite
* Brazilianite
* Eosphorite
* Fluorapatite
* Hydroxyapatite
* Lithiophilite
* Metatorbernite
* Monazite
* Struvite
* Taranakite
* Variscite
* Wavellite
* Xenotime

Cryptocrystalline|

* Turquoise
* Whitlockite

Amorphous|

* Santabarbaraite
* Scorodite
* Cobalt phosphate

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