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Seifertite

A valid IMA mineral species
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Discuss Seifertite
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Formula:
SiO2
Specific Gravity:
4.294 (Calculated)
Crystal System:
Orthorhombic
Member of:
Silica Group
Name:
Named in honour of Dr. Friedrich Seifert (1941- ), founding Director of the Bayerisches Geoinstitut (Bavarian Geoinstitute) at Bayreuth, Germany, for his contributions to high-pressure geoscience.
The densest and hardest polymorph of silica found in nature so far, with a structure similar to that of alpha-PbO2. Found first in the Shergotty meteorite, and since then in several other Martian meteorites. Stable only above pressures of 780 kilobars, so it could theoretically also form in the Earth's mantle at depths over 1,700 km, if any free silica is present. Suggested as a minor phase near the core-mantle boundary by Zhang et al. (2016), who synthesized seifertite; in the experiment it was associated with (Mg,Fe)SiO3 post-perovskite.


Approval year:
2004
First published:
Type description reference:

Classification of Seifertite
Dana 8th ed.:
75.1.6.

75 : TECTOSILICATES Si Tetrahedral Frameworks
1 : Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

Mineral Symbols

Crystallography of Seifertite
General Appearance of Type Material:

lamellae occurring in composit silica grains
Place of Conservation of Type Material:
Museum of the Geological Survey in Calcutta, India.
Geological Setting of Type Material:
Presumably formed by impact shock in basaltic Mars rock.
Reference:
El Goresy, A., Dera, P., Sharp, T.G., Prewitt, C.T., Chen, M., Dubrovinsky, L., Wopenka, B., Boctor, N.Z., Hemley, R.J. (2008) Seifertite, a dense orthorhombic polymorph of silica from the Martian meteorites Shergotty and Zagami. European Journal of Mineralogy: 20: 523-528.

Synonyms of Seifertite

Other Language Names for Seifertite

Relationship of Seifertite to other Species
Other Members of Silica:
ChibaiteSiO2 · n(CH4, C2H6, C3H8, i-C4H10) (n = 3/17 (max))Iso.m3(2/m3) :Fd3
CoesiteSiO2Mon. 2/m :B2/b
CristobaliteSiO2Tet. 422 :P41212
KeatiteSiO2Tet. 422 :P43212
LechatelieriteSiO2Amor.
Melanophlogite46SiO2 · 6(N2,CO2) · 2(CH4,N2)Tet. 4/mmm(4/m2/m2/m)
MogániteSiO2Mon. 2/m
Opal-AGSiO2 · nH2O
Opal-ANSiO2 · nH2O
Opal-CSiO2 · nH2O
Opal-CTSiO2 · nH2O
QuartzSiO2Trig. 32 :P3121
Quartz-betaSiO2Hex. 622 :P6422
StishoviteSiO2Tet. 4/mmm(4/m2/m2/m) :P42/mnm
TridymiteSiO2Tric. 1
β-CristobaliteSiO2Iso.m3m(4/m32/m) :Fd3m
β-TridymiteSiO2

Related Minerals -Strunz-mindat GroupingHex. 6/mmm(6/m2/m2/m) :P6/mmm4.DA.ChibaiteSiO2 · n(CH4, C2H6, C3H8, i-C4H10) (n = 3/17 (max))Iso.m3(2/m3) :Fd34.DA.Carbon Dioxide IceCO24.DA.05QuartzSiO2Trig. 32 :P31214.DA.10TridymiteSiO2Tric. 14.DA.10OpalSiO2 · nH2O4.DA.15CristobaliteSiO2Tet. 422 :P412124.DA.20MogániteSiO2Mon. 2/m4.DA.25Melanophlogite46SiO2 · 6(N2,CO2) · 2(CH4,N2)Tet. 4/mmm(4/m2/m2/m)4.DA.30LechatelieriteSiO2Amor.4.DA.35CoesiteSiO2Mon. 2/m :B2/b4.DA.40StishoviteSiO2Tet. 4/mmm(4/m2/m2/m) :P42/mnm4.DA.45KeatiteSiO2Tet. 422 :P432124.DA.55Quartz-betaSiO2Hex. 622 :P6422

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    • References for SeifertiteⓘShergotty Martian meteorite (TL)El Goresy et al. (2008)
    Nigeria
     
    Zhidong Xie et al. (2005)
    Northwest Africa Meteorites
     
    Shohei Kaneko et al. (2011)+1 other reference
    The Moon
     
    Pang et al. (2022)+1 other reference
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