Schreyerite Mineral Data

General Schreyerite Information

Chemical Formula:

V+++2Ti3O9

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

Empirical Formula:

Environment:

Microscopic inclusions in rutile found in a V-enriched gneiss. Polymorph of kyzylkumite.

IMA Status:

Approved IMA 1976

Locality:

Kwale District, S of Voi, Kenya. Link to MinDat.org Location Data.

Name Origin:

Named for Werner Schreyer (1930-), Ruhr University, Bochum, Germany.

Name Pronunciation:

Schreyerite + Pronunciation

Schreyerite Image

Images:

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

Axial Ratios:

a:b:c =3.4031:1:1.4044

Cell Dimensions:

a = 17.102, b = 5.0253, c = 7.0579, Z = 4; beta = 106.636° V = 581.19 Den(Calc)= 4.46

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 2.737(1), 2.874(0.7), 4.075(0.5),

Physical Properties of Schreyerite

Color:

Black brown.

Diaphaneity:

Opaque to subtranslucent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

7 - Quartz

Luster:

Metallic

Optical Properties of Schreyerite

Gladstone-Dale:

CI calc= -0.093 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3812,KC= 0.3489
Ncalc = 2.56

Optical Data:

Biaxial (?), a=2.7

Calculated Properties of Schreyerite

Electron Density:

Bulk Density (Electron Density)=4.21 gm/cc
note: Specific Gravity of Schreyerite =4.46 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Schreyerite= 11.57 barns/electron
U=PE_Schreyerite x rElectron Density= 48.72 barns/cc.

Radioactivity:

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

Schreyerite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin v91, p196) OPTIC PROP.(Dana8)

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

Schreyerite

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

Notes:

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