Schreyerite Mineral Data

Schreyerite Mineral Data +

General Schreyerite Information

Chemical Formula:

V+++2Ti3O9

Composition:

Molecular Weight = 389.52 gm

Titanium 36.88 % Ti 61.52 % TiO₂

Vanadium 26.16 % V 38.48 % V₂O₃

Oxygen 36.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

V³⁺₂Ti₃O₉

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.

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Schreyerite Crystallography

Axial Ratios:

a:b:c =1.4091:1:3.7405

Cell Dimensions:

a = 7.06, b = 5.01, c = 18.74, Z = 4; beta = 119.4° V = 577.48 Den(Calc)= 4.48

Crystal System:

MonoclinicSpace Group: Unk

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

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

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

Color:

Black brown.

Diaphaniety:

Opaque to subtranslucent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

7 - Quartz

Luster:

Metallic

Optical Properties of Schreyerite

Gladstone-Dale:

CI calc= -0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3795,KC= 0.3491

Optical Data:

Biaxial (?), a=2.7

Calculated Properties of Schreyerite

Electron Density:

r_electron=4.23 gm/cc
note: r_Schreyerite=4.48 gm/cc.

Fermion Index

Fermion Index = 0.04851
Boson Index = 0.95149

Photoelectric:

PE_Schreyerite= 11.27 barns/electron
U=PE_Schreyerite x r_electron= 47.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schreyerite is Not Radioactive

Schreyerite Classification

Dana Class:

8.4.1.1 (8)Multiple Oxides with Nb, Ta, and Ti

(8.4)with miscellaneous formulae

(8.4.1)Dana Group

8.4.1.1 Schreyerite V2Ti3O9 Unk Mono

8.4.1.2 Olkhonskite (Cr,V)2Ti3O9 Unk Mono

8.4.1.3 Kyzylkumite V2Ti3O9 Unk Mono

Strunz Class:

IV/C.26-20 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.26 - Berdesinskiite - Stibivanite series

IV/C.26-10 Berdesinskiite V2TiO5 P 2/c or Pc Mono

IV/C.26-15 Olkhonskite (Cr,V)2Ti3O9 Unk Mono

IV/C.26-20 Schreyerite V2Ti3O9 Unk Mono

IV/C.26-30 Kyzylkumite V2Ti3O9 Unk Mono

IV/C.26-40 Stibivanite Sb2VO5 C 2/c 2/m

Other Schreyerite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Schreyerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Schreyerite

V+++2Ti3O9
Dana No: 8.4.1.1 Strunz No: IV/C.26-20
Locality:

Notes: