Seifertite Mineral Data

Seifertite Mineral Data
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General Seifertite Information

Help on Chemical Formula: Chemical Formula: SiO2
Help on Composition: Composition: Molecular Weight = 60.08 gm
   Silicon  46.74 %  Si  100.00 % SiO2
   Oxygen   53.26 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SiO2
Help on Environment: Environment: Found as lamellae occurring together with dense silica glass lamellae in composite silica grains in the heavily shocked Martian meteorite. Polymorphous with quartz.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: 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.
Help on Name Origin: 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.
Help on Synonym: Synonym: IMA2004-010
 

Seifertite Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =0.8118:1:0.8906
Help on Cell Dimensions: Cell Dimensions: a = 4.097, b = 5.0462, c = 4.4946, Z = 4; V = 92.92 Den(Calc)= 4.29
Help on Crystal System: Crystal System: OrthorhombicSpace Group: P bcn or Pb2n
Help on X Ray Diffraction: 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),
Click Here for Large Seifertite Structure Window 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

Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
 

Optical Properties of Seifertite

Help on Optical Data: Optical Data: NCalc= 1.89 - from Gladstone-Dale relationship (KC = 0.208) where Ncalc=Dcalc*KC+1
 

Calculated Properties of Seifertite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Seifertite =4.29 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESeifertite = 1.80 barns/electron
U=PESeifertite x rElectron Density= 7.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Seifertite is Not Radioactive
 

Seifertite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( AmMin, v94:403) PHYS. PROP.(AmMin, v94:403) OPTIC PROP.(AmMin, v94:403)
Help on See Also: 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
Locality:

 

Notes: