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Seifertite

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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.
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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Classification of SeifertiteHide

Approved
Approval Year:
2004
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

Physical Properties of SeifertiteHide

Density:
4.294 g/cm3 (Calculated)

Chemical Properties of SeifertiteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.39(
2.90(
Comments:
characteristic reflections

Type Occurrence of SeifertiteHide

General Appearance of Type Material:
lamellae occurring in composit silica grains
Geological Setting of Type Material:
Presumably formed by impact shock in basaltic Mars rock.

Synonyms of SeifertiteHide

Other Language Names for SeifertiteHide

German:Seifertit
Simplified Chinese:塞石英

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.45KeatiteSiO2

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.

References for SeifertiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Bläß, U., Langenhorst, F. (2011) High-pressure phase transformation of SiO2 polymorphs to Seifertite. Joint Meeting of the DGK, DMG and ÖMG, Salzburg, Austria, September 20-24, 2011; Abstracts Volume, p. 46.
Zhang, L., Popov, D., Meng, Y., Wang, J., Ji, C., Li, B., Mao, H. (2016): In-situ crystal structure determination of seifertite SiO2 at 129 GPa: Studying a minor phase near Earth’s core–mantle boundary. American Mineralogist: 101: 231-234

Internet Links 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 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.
India (TL)
 
  • Bihar
    • Gaya District
El Goresy, A. et al. (2008):European J. Mineralogy 20,523-528.
Nigeria
 
  • Katsina State
Zhidong Xie et al. , Lunar and Planetary Science XXXVI (2005), 1216.pdf
Northwest Africa Meteorites
 
Shohei Kaneko, Eiji Ohtani, Masaaki Miyahara, Takeshi Sakai, Masahiro Kayama, Hirotsugu Nishido, Yasuo Oishi, Naohisa Hirao (2011) Dynamic event recorded in a lunar meteorite NWA 4734. Japan Geooscience Union Meeting Makuhari, Chiba Japan.; Wang, Y., & Hsu, W. (2016). Shock-Induced Metamorphism in the Lunar Meteorite Northwest Africa 4734. LPI Contributions, 1921.
Mineral and/or Locality  
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