Olkhonskite Mineral Data

Olkhonskite Mineral Data +

General Olkhonskite Information

Chemical Formula:

(Cr+++,V+++)2Ti3O9

Composition:

Molecular Weight = 391.10 gm

Titanium 36.73 % Ti 61.27 % TiO₂

Vanadium 6.51 % V 9.58 % V₂O₃

Chromium 19.94 % Cr 29.15 % Cr₂O₃

Oxygen 36.82 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cr_1.5V³⁺_0.5Ti₃O₉

Environment:

In quartzite-schists.

IMA Status:

Approved IMA 1994

Locality:

On the western shore of Lake Baikal, 4.5 km south of the Olkhon Island, Russia. Link to MinDat.org Location Data.

Name Origin:

For the locality.

Synonym:

IMA1993-035

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Olkhonskite Crystallography

Axial Ratios:

a:b:c =1.4003:1:3.7509

Cell Dimensions:

a = 7.03, b = 5.02, c = 18.83, Z = 4; beta = 119.6° V = 577.80 Den(Calc)= 4.50

Crystal System:

MonoclinicSpace Group: Unk

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

By Intensity(I/I_o): 1.386(1), 2.75(1), 2.88(0.7),

Physical Properties of Olkhonskite

Cleavage:

None

Color:

Black.

Density:

4.48

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

8 - Topaz

Luster:

Metallic

Streak:

black

Optical Properties of Olkhonskite

Optical Data:

NCalc= 2.58 - from Gladstone-Dale relationship (KC = 0.3521) where Ncalc=Dcalc*KC+1
NCalc= 2.58 - from Gladstone-Dale relationship (KC = 0.3521) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Weak.

RL Bireflectance:

Noticeable.

RL Color:

Light gray.

RL Pleochroism:

Weak in brownish tints.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Olkhonskite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
440 nm	22.50	19.60
460 nm	21.10	18.20
480 nm	20.10	18.20
500 nm	20.30	18.20
520 nm	19.80	18.40
540 nm	20.00	18.50
560 nm	20.30	18.50
580 nm	20.20	18.40
600 nm	20.10	18.40
620 nm	20.50	18.40
640 nm	21.00	18.50
660 nm	21.30	19.50
680 nm	22.40	20.70
700 nm	22.60	20.80

**Calculated Relative Intensity Colors of Olkhonskite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	480%
R₁
R₂

Calculated Properties of Olkhonskite

Electron Density:

r_electron=4.27 gm/cc
note: r_Olkhonskite=4.50 gm/cc.

Fermion Index

Fermion Index = 0.06677
Boson Index = 0.93323

Photoelectric:

PE_Olkhonskite= 11.98 barns/electron
U=PE_Olkhonskite x r_electron= 51.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Olkhonskite is Not Radioactive

Olkhonskite Classification

Dana Class:

8.4.1.2 (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.26-15 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 Olkhonskite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(AntBidBlaNic3, MinRec v 27, p 304)

See Also:

Links to other databases for Olkhonskite :
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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Olkhonskite

(Cr+++,V+++)2Ti3O9
Dana No: 8.4.1.2 Strunz No: IV/C.26-15
Locality:

Notes: