Schreyerite Mineral Data

Schreyerite Mineral Data
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General Schreyerite Information

Help on Chemical Formula: Chemical Formula: V+++2Ti3O9
Help on Composition: Composition: Molecular Weight = 390.36 gm
   Titanium  31.11 %  Ti   51.89 % TiO2
   Vanadium  29.40 %  V    34.17 % V2O3 /  9.77 % VO2
   Chromium   2.09 %  Cr    3.06 % Cr2O3
   Iron       0.52 %  Fe    0.74 % Fe2O3
   Oxygen    36.89 %  O
            ______        ______ 
            100.00 %       99.63 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula:
Help on Environment: Environment: Microscopic inclusions in rutile found in a V-enriched gneiss. Polymorph of kyzylkumite.
Help on IMA Status: IMA Status: Approved IMA 1976
Help on Locality: Locality: Kwale District, S of Voi, Kenya. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Werner Schreyer (1930-), Ruhr University, Bochum, Germany.
Help on Name Pronunciation: Name Pronunciation: Schreyerite + Pronunciation Say SCHREYERITE
 

Schreyerite Image

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Schreyerite

Comments: SEM image of schreyerite crystal studied by single-crystal X-ray diffraction. AmMin, v91, p197.
Location: Metamorphic rocks of the Sludyanka complex at the southern shore of Lake Baikal, Russia. Scale: Picture width 0.14 mm.
© American Mineralogist

Schreyerite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =3.4031:1:1.4044
Help on Cell Dimensions: Cell Dimensions: a = 17.102, b = 5.0253, c = 7.0579, Z = 4; beta = 106.636° V = 581.19 Den(Calc)= 4.46
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.737(1), 2.874(0.7), 4.075(0.5),
Click Here for Large Schreyerite Structure Window Crystal Structure:

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Dobelin N , Reznitsky L Z , Sklyarov E V , Armbruster T , Medenbach O , American Mineralogist , 91 (2006) p.196-202, Schreyerite, V2Ti3O9: New occurrence and crystal structure, Locality: Sludyanka complex at the southern shore of Lake Baikal, Russia

 

Physical Properties of Schreyerite

Help on Color: Color: Black brown.
Help on Diaphaneity: Diaphaneity: Opaque to subtranslucent
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Metallic
 

Optical Properties of Schreyerite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.093 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3812,KC= 0.3489
Ncalc = 2.56
Help on Optical Data: Optical Data: Biaxial (?), a=2.7
 

Calculated Properties of Schreyerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.21 gm/cc
note: Specific Gravity of Schreyerite =4.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PESchreyerite = 11.57 barns/electron
U=PESchreyerite x rElectron Density= 48.72 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schreyerite is Not Radioactive
 

Schreyerite Classification
Help on Dana Class: Dana Class: 08.04.01.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.04)with miscellaneous formulae
  (08.04.01)Schreyerite Group
 
08.04.01.01 Schreyerite V2Ti3O9 C 2/c 2/m
 
08.04.01.02 Olkhonskite (Cr,V)2Ti3O9 Unk Mono
 
08.04.01.03 Kyzylkumite V2Ti3O9 Unk Mono
Help on Strunz Class: Strunz Class: 04.CB.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.C - Metal:Oxygen = 2:3, 3:5, and Similar
  04.CB -With medium-sized cations
 
04.CB.35 Olkhonskite (Cr,V)2Ti3O9 Unk Mono
 
04.CB.35 Schreyerite V2Ti3O9 C 2/c 2/m
 

Other Schreyerite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, AmMin v91, p196) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Schreyerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Schreyerite

V+++2Ti3O9
Dana No: 08.04.01.01 Strunz No: 04.CB.35
Locality:

 

Notes: