Seifertite Mineral Data

General Seifertite Information

Chemical Formula:

SiO2

Composition:

Molecular Weight = 60.08 gm

Silicon 46.74 % Si 100.00 % SiO₂

Oxygen 53.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SiO₂

Environment:

Found as lamellae occurring together with dense silica glass lamellae in composite silica grains in the heavily shocked Martian meteorite. Polymorphous with quartz.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Shergotty SNC meteorite. Shergotty is a basaltic achondrite that fell on August 25, 1865 in Bihar State in India. Link to MinDat.org Location Data.

Name Origin:

Name for Friedrich A. Seifert (b. 1941), founding Director of the Bayerische Geoinstitut, Universität Bayreuth, Germany, for his important contributions to high-pressure geoscience.

Synonym:

IMA2004-010

Seifertite Image

Images:

Seifertite

Comments: BSE-SEM showing white lamellae are seifertite and the black lamellae consisting of dense SiO2 glass, probably formed by vetrification of another metastable post-stishovite silica plolymorph.
Location: Shergotty meteorite. Scale: See Image.
© Bavarian Research Institute

Seifertite Crystallography

Axial Ratios:

a:b:c =0.8118:1:0.8906

Cell Dimensions:

a = 4.097, b = 5.0462, c = 4.4946, Z = 4; V = 92.92 Den(Calc)= 4.29

Crystal System:

OrthorhombicSpace Group: P bcn or Pb2n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.596(1), 3.181(0.72), 1.938(0.64),1.499(0.44), 1.514(0.31), 1.97(0.25), 1.288(0.19), 1.265(0.15),

Crystal Structure:

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Dera P , Prewitt C T , Boctor N Z , Hemley R J , American Mineralogist , 87 (2002) p.1018-1023, Characterization of a high-pressure phase of silica from the, Martian meteorite Shergotty, alpha-PbO2-like

Physical Properties of Seifertite

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Optical Properties of Seifertite

Optical Data:

NCalc= 1.89 - from Gladstone-Dale relationship (KC = 0.208) where Ncalc=Dcalc*KC+1

Calculated Properties of Seifertite

Electron Density:

Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Seifertite =4.29 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Seifertite= 1.80 barns/electron
U=PE_Seifertite x rElectron Density= 7.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Seifertite is Not Radioactive

Seifertite Classification

Dana Class:

75.01.05.01 (75)Tectosilicate Si Tetrahedral Frameworks

(75.01)SiO2 with [4] coordinated Si

(75.01.05)Dana Group

75.01.05.01 Seifertite! SiO2 P bcn or Pb2n Ortho

Strunz Class:

04.DA.50 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DA -With small cations

04.DA.50 Seifertite! SiO2 P bcn or Pb2n Ortho

Other Seifertite Information

References:

NAME( AmMin, v94:403) PHYS. PROP.(AmMin, v94:403) OPTIC PROP.(AmMin, v94:403)

See Also:

Links to other databases for Seifertite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Seifertite Specimen Label here :

Seifertite

SiO2
Dana No: 75.01.05.01 Strunz No: 04.DA.50
Locality:

Notes: