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|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.
Classification of Seifertite
|IMA status:||Approved 2004|
|Nickel-Strunz 10th (pending) edition ID:||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
|Dana 8th edition ID:||75.1.6.|
75 : TECTOSILICATES Si Tetrahedral Frameworks
1 : Si Tetrahedral Frameworks - SiO2 with  coordinated Si
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Type Occurrence of Seifertite
|Type Locality:||Shergotty Martian meteorite, Gaya District, Bihar, India|
|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.|
Occurrences of Seifertite
|Geological Setting:||Meteorites derived from Martian basalt.|
Physical Properties of Seifertite
|Density (calculated):||4.294 g/cm3|
Crystallography of Seifertite
|Class (H-M):||mmm (2/m 2/m 2/m) - Dipyramidal|
|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 Volume:||V 92.92 Å³|
Chemical Properties of Seifertite
|Simplified for copy/paste:||SiO2|
|Essential elements:||O, Si|
|All elements listed in formula:||O, Si|
Relationship of Seifertite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
Other Names for Seifertite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Seifertite
A. El Goresy, P. Dera, T.G. Sharp, C.T. Prewitt, M. Chen, L. Dubrovinsky, B. Wopenka, N.Z. Boctor, R.J. Hemley (2008): Seifertite, a dense orthorhombic polymorph of silica from the Martian meteorites Shergotty and Zagami. European Journal of Mineralogy 20, 523-528.
U. Bläß, F. Langenhorst (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.
Internet Links for Seifertite
Localities for Seifertite
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Carthage meteorite, Carthage, Smith Co., Tennessee, USAFrom Chester S. Lemanski, Jr., 20th Dec 2014 00:17:21