Keatite

Tetragonal polymorph of silica, mineral

Keatite

Crystal structure

General
Category| Tectosilicate, quartz group
Formula
(repeating unit)| SiO2
Strunz classification| 4.DA.45
Crystal system| Tetragonal
Identification
Crystal habit| Microscopic inclusions

Keatite is a silicate mineral with the chemical formula SiO2 (silicon dioxide) that was discovered in nature in 2013. It is a tetragonal polymorph of silica first known as a synthetic phase.[1] It was reported as minute inclusions within clinopyroxene (diopside) crystals in an ultra high pressure garnet pyroxenite body. The host rock is part of the Kokchetav Massif in Kazakhstan.[2]

Keatite was synthesized in 1954 and named for Paul P. Keat who discovered it while studying the role of soda in the crystallization of amorphous silica.[3] Keatite was well known before 1970 as evidenced in few studies from that era.[4][5]

## References

[edit]

1. ^ Ralph, Jolyon, and Ida Ralph. "Keatite: Keatite Mineral Information and Data." MinDat. 2013. Aug. 2013
2. ^ Abstract Hill, Tina R., Hiromi Konishi, and Huifang Xu, Natural occurrence of keatite precipitates in UHP clinopyroxene from the Kokchetav Massif: A TEM investigation, American Mineralogist, Volume 98, pages 187–196, 2013
3. ^ Science 120 (27 Aug1954) pp 328-330 with the title "A new crystalline silica.
4. ^ Li, C. T. (1971). "Transformation mechanism between high-quartz and keatite phases of LiAlSi2O6 composition". Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 27 (6): 1132–1140\. doi:10.1107/S0567740871003649.1132-1140&rft.date=1971&rft_id=info:doi/10.1107/S0567740871003649&rft.aulast=Li&rft.aufirst=C.+T.&rft_id=http://scripts.iucr.org/cgi-bin/paper?a08203&rfr_id=info:sid/en.wikipedia.org:Keatite" class="Z3988">
5. ^ Martin, Brigitte (December 1995). "Keatite; II, Hydrothermal synthesis from silica-glass". European Journal of Mineralogy. 7 (6): 1389–1397\. Bibcode:1995EJMin...7.1389M. doi:10.1127/ejm/7/6/1389.1389-1397&rft.date=1995-12&rft_id=info:doi/10.1127/ejm/7/6/1389&rft_id=info:bibcode/1995EJMin...7.1389M&rft.aulast=Martin&rft.aufirst=Brigitte&rft_id=http://eurjmin.geoscienceworld.org/content/7/6/1389&rfr_id=info:sid/en.wikipedia.org:Keatite" class="Z3988">

* v
* t
* e

Silica minerals

Crystalline|

* Coesite
* Cristobalite
* Keatite
* Moganite
* Quartz
* Seifertite
* Stishovite
* Tridymite

Cryptocrystalline|

* Chalcedony
* Chert
* Flint
* Jasper

Amorphous|

* Fulgurite
* Lechatelierite
* Opal

Miscellaneous|

* Tiger's eye
* Aqeeq

Notable varieties|

| Chalcedony|

* Agate
* Carnelian
* Chrome chalcedony
* Chrysoprase
* Heliotrope
* Moss agate
* Onyx

|

Opal|

* Fiorite
* Geyserite

Quartz|

* Amethyst
* Ametrine
* Herkimer diamond
* Citrine
* Smoky quartz
* Shocked quartz
* Prasiolite

Minerals portal

This article about a specific silicate mineral is a stub. You can help Wikipedia by expanding it.

|

* v
* t
* e

This article about materials science is a stub. You can help Wikipedia by expanding it.

|

* v
* t
* e

*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template