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Seifertite

A valid IMA mineral species
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Formula:
SiO2
Specific Gravity:
4.294 (Calculated)
Crystal System:
Orthorhombic
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.


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Unique IdentifiersHide

Mindat ID:
26715
Long-form identifier:
mindat:1:1:26715:1
GUID
(UUID V4):
eaa12ac4-b2b5-44d2-93d8-a322603c9eed

IMA Classification of SeifertiteHide

Classification of SeifertiteHide

4.DA.50

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
75.1.6.

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
SftIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SeifertiteHide

Density:
4.294 g/cm3 (Calculated)

Chemistry of SeifertiteHide

Mindat Formula:
SiO2

Crystallography of SeifertiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Cell Parameters:
a = 4.097(1) Å, b = 5.0462(8) Å, c = 4.4946(8) Å
Ratio:
a:b:c = 0.812 : 1 : 0.891
Unit Cell V:
92.92 ų
Z:
4
Comment:
parameters for the synthesized material (Zhang et al., 2016): a=3.7277, b=4.6576, c=4.1609, V=72.243

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0002871SeifertiteDera P, Prewitt C T, Boctor N Z, Hemley R J (2002) Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty alpha-PbO2-like American Mineralogist 87 1018-102320020293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.596 Å(100)
3.181 Å(72)
1.938 Å(64)
1.4199 Å(44)
1.514 Å(31)
1.970 Å(25)
1.288 Å(19)
Comments:
characteristic reflections
Quickly amorphizes under electron, laser or ion beams.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration4.566-4.550
6 : Secondary asteroid phases4.566-4.560
Geological Setting:
Meteorites derived from Martian basalt.

Type Occurrence of SeifertiteHide

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 SeifertiteHide

Other Language Names for SeifertiteHide

German:Seifertit
Simplified Chinese:塞石英

Related Minerals - Strunz-mindat GroupingHide

4.DA.ChibaiteSiO2 · n(CH4, C2H6, C3H8, i-C4H10) (n = 3/17 (max))Iso. m3 (2/m 3) : Fd3
4.DA.Carbon Dioxide IceCO2
4.DA.BosoiteSiO2 · nCxH2x+2Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
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. 2/m
4.DA.25Melanophlogite46SiO2 · 6(N2,CO2) · 2(CH4,N2)Tet. 4/mmm (4/m 2/m 2/m)
4.DA.30LechatelieriteSiO2Amor.
4.DA.35CoesiteSiO2Mon. 2/m : B2/b
4.DA.40StishoviteSiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DA.45KeatiteSiO2Tet. 4 2 2 : P43 21 2
4.DA.55Quartz-betaSiO2Hex. 6 2 2 : P64 2 2

Other InformationHide

Notes:
Easily destroyed by irradiation (focused electron, laser or ion beams).
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 SeifertiteHide

References for SeifertiteHide

Localities for SeifertiteHide

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 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.
India (TL)
 
  • Bihar
    • Gaya District
El Goresy et al. (2008)
Nigeria
 
  • Katsina
    • Faskari
Zhidong Xie et al. (2005)
Northwest Africa Meteorites
 
Shohei Kaneko et al. (2011) +1 other reference
The Moon
 
  • Oceanus Procellarum (Ocean of Storms)
Pang et al. (2022) +1 other reference
 
and/or  
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