| |
 |
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: |
Cr1.5V3+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: |
Named for the locality. |
| Name Pronunciation: |
Olkhonskite + Pronunciation  |
| Synonym: |
IMA1993-035 |
| |
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: |
Monoclinic Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 1.386(1), 2.75(1), 2.88(0.7), |
| |
Physical Properties of Olkhonskite
|
| Cleavage: |
None |
| Color: |
Black. |
| Density: |
4.48 |
| Diaphaneity: |
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: |
Bulk Density (Electron Density)=4.27 gm/cc
note: Specific Gravity of Olkhonskite =4.50 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.06
Boson Index = 0.94 |
| Photoelectric: |
PEOlkhonskite = 11.98 barns/electron
U=PEOlkhonskite x rElectron Density= 51.13 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Olkhonskite is Not Radioactive |
| |
Olkhonskite Classification
|
| Dana Class: |
08.04.01.02 (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 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 - 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
Search for Olkhonskite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Olkhonskite :
Ask about Olkhonskite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espaņol
Print or Cut-and-Paste your Olkhonskite Specimen Label here :
|
Olkhonskite
(Cr+++,V+++)2Ti3O9
Dana No: 08.04.01.02 Strunz No: 04.CB.35
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.