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Keatite

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A name originally given to a synthetic tetragonal polymorph of silica (Keat, 1954; Shropshire et al, 1959).
Recently found in ultrahigh-pressure rocks (Hill et al., 2013).



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Classification of KeatiteHide

Notes:
Unnamed (probably valid)
Approval History:
Unnamed, but probably valid.
4.DA.45

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
A : With small cations: Silica family

Chemical Properties of KeatiteHide

Formula:
SiO2

Synonyms of KeatiteHide

Other Language Names for KeatiteHide

German:Keatit
Spanish:Keatita

Related Minerals - Nickel-Strunz GroupingHide

4.DA.Carbon Dioxide IceCO2
4.DA.05QuartzSiO2Trig. 3 2 : P31 2 1
4.DA.10OpalSiO2 · nH2O
4.DA.10TridymiteSiO2Tric. 1
4.DA.15CristobaliteSiO2Tet. 4 2 2 : P41 21 2
4.DA.20MogániteSiO2Mon.
4.DA.25Melanophlogite46SiO2 · 6(N2,CO2) · 2(CH4,N2)Tet.
4.DA.30LechatelieriteSiO2
4.DA.35CoesiteSiO2Mon. 2/m : B2/b
4.DA.40StishoviteSiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DA.50SeifertiteSiO2Orth. mmm (2/m 2/m 2/m) : Pbcn

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for KeatiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Keat, P.P. (1954) A new crystalline silica. Science: 120: 328-330.
Shropshire, J., Keat, P.P., Vaughan, P.A. (1959) The crystal structure of keatite, a new form of silica. Zeitschrift für Kristallographie: 112: 409-413.
Hill, T. R., Konishi, H., Xu, H. (2013) Natural occurrence of keatite precipitates in UHP clinopyroxene from the Kokchetav Massif: A TEM investigation. American Mineralogist: 98: 187-196.

Internet Links for KeatiteHide

Localities for KeatiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Kazakhstan
 
  • Akmola Province (Aqmola Oblysy; Akmolinskaya Oblast')
    • Kokshetau (Kökshetau; Kokchetau; Kokchetav)
Hill, T. R., Konishi, H. and Xu, H. (2013): Natural occurrence of keatite precipitates in UHP clinopyroxene from the Kokchetav Massif: A TEM investigation. American Mineralogist, 98, 187-196.
Mineral and/or Locality  
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