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, Universit�t 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:
Orthorhombic Space Group: P bcn or Pb2n
X Ray Diffraction:
By Intensity(I/Io ): 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),
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:
PESeifertite = 1.80 barns/electronU=PESeifertite x r Electron 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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Seifertite
SiO2
Dana No: 75.01.05.01 Strunz No: 04.DA.50
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