Keatite
Valid as an unnamed mineral
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Formula:
SiO2
Crystal System:
Tetragonal
Polymorph of:
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).
Recently found in ultrahigh-pressure rocks (Hill et al., 2013).
Unique Identifiers
Mindat ID:
2173
Long-form identifier:
mindat:1:1:2173:5
GUID
(UUID V4):
(UUID V4):
2dd2862e-1266-488b-bc61-e0c0ff771671
IMA Classification of Keatite
IMA status notes:
Unnamed (probably valid)
Approval history:
Unnamed, but probably valid.
Classification of Keatite
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
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
Chemistry of Keatite
Mindat Formula:
SiO2
Elements listed:
Crystallography of Keatite
Crystal System:
Tetragonal
Class (H-M):
4 2 2 - Trapezohedral
Space Group:
P43 21 2
Cell Parameters:
a = 7.4462(1) Å, c = 7.4462(4) Å
Ratio:
a:c = 1 : 1
Unit Cell V:
475.93 ų
Z:
1
Comment:
R(F) = 0.037, T = 293 K; Grosskreuz & Marler (2023)
Synonyms of Keatite
Other Language Names for Keatite
Related Minerals - Strunz-mindat Grouping
4.DA. | Chibaite | SiO2 · n(CH4, C2H6, C3H8, i-C4H10) (n = 3/17 (max)) |
4.DA. | Carbon Dioxide Ice | CO2 |
4.DA. | Bosoite | SiO2 · nCxH2x+2 |
4.DA.05 | Quartz | SiO2 |
4.DA.10 | Opal | SiO2 · nH2O |
4.DA.10 | Tridymite | SiO2 |
4.DA.15 | Cristobalite | SiO2 |
4.DA.20 | Mogánite | SiO2 |
4.DA.25 | Melanophlogite | 46SiO2 · 6(N2,CO2) · 2(CH4,N2) |
4.DA.30 | Lechatelierite | SiO2 |
4.DA.35 | Coesite | SiO2 |
4.DA.40 | Stishovite | SiO2 |
4.DA.50 | Seifertite | SiO2 |
4.DA.55 | Quartz-beta | SiO2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Keatite
mindat.org URL:
https://www.mindat.org/min-2173.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Keatite
Reference List:
Localities for Keatite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Kazakhstan | |
| Hill et al. (2013) |
Russia | |
| Kokh et al. (2023) |