Olkhonskite
A valid IMA mineral species
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About Olkhonskite
Unique Identifiers
Mindat ID:
2985
Long-form identifier:
mindat:1:1:2985:4
GUID
(UUID V4):
(UUID V4):
33bf8198-d9b6-4338-8b63-bf31f67e28aa
IMA Classification of Olkhonskite
Approved
IMA Formula:
Cr2Ti3O9
First published:
1994
Classification of Olkhonskite
4.CB.35
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
8.4.1.2
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
4 : A2B3O9
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
4 : A2B3O9
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Olk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Olkhonskite
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
8 on Mohs scale
Hardness:
VHN65=1412 kg/mm2 - Vickers
Tenacity:
Brittle
Density:
4.48 g/cm3 (Calculated)
Optical Data of Olkhonskite
Anisotropism:
Weak
Bireflectance:
noted
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
440nm | 19.6% | 22.5% |
460nm | 18.2% | 21.1% |
470nm | 18.1% | 20.1% |
480nm | 18.2% | 20.1% |
500nm | 18.2% | 20.3% |
520nm | 18.4% | 20.1% |
540nm | 18.5% | 20.0% |
546nm | 18.5% | 19.9% |
560nm | 18.5% | 20.3% |
580nm | 18.4% | 20.2% |
589nm | 18.4% | 19.8% |
600nm | 18.4% | 20.1% |
620nm | 18.4% | 20.5% |
640nm | 18.5% | 21.0% |
650nm | 18.6% | 20.0% |
660nm | 19.5% | 21.3% |
680nm | 20.7% | 22.4% |
700nm | 20.8% | 22.6% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 22.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Light gray
Pleochroism:
Weak
Comments:
in browns
Chemistry of Olkhonskite
Mindat Formula:
(Cr,V)2Ti3O9
Elements listed:
Crystallography of Olkhonskite
Crystal System:
Monoclinic
Cell Parameters:
a = 7.03(1) Å, b = 5.02(1) Å, c = 18.83(1) Å
β = 119.60(5)°
β = 119.60(5)°
Ratio:
a:b:c = 1.4 : 1 : 3.751
Unit Cell V:
577.80 ų (Calculated from Unit Cell)
Z:
4
Comment:
Point Group: 2/m or m.; Space Group: C2/c, Cc, P21/c, P2/c, or P c. (by analogy to schreyerite)
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.75 Å | (100) |
1.386 Å | (100) |
2.88 Å | (70) |
2.43 Å | (70) |
1.426 Å | (70) |
2.14 Å | (50) |
1.660 Å | (50) |
Comments:
Ol'khonskiye Vorota Strait, Lake Baikal area, Russia. Data from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 5: Initiation of plate tectonics | <3.5-2.5 |
40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Olkhonskite
General Appearance of Type Material:
Platy crystals, to 150 µm, included in rutile.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, r1001.
Geological Setting of Type Material:
In quartzite schists.
Associated Minerals at Type Locality:
Reference:
Koneva, A.A., Piskunova, L.F., Ushchapovskaya, Z.F., Konev, A.A. (1994) Olkhonskite (Cr, V)2Ti3O9 — a new mineral from Priol'khonie. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 123(4): 98-103.
Synonyms of Olkhonskite
Other Language Names for Olkhonskite
German:Olkhonskit
Spanish:Olkhonskita
Common Associates
Associated Minerals Based on Photo Data:
4 photos of Olkhonskite associated with Rutile | TiO2 |
1 photo of Olkhonskite associated with Karelianite | V3+2O3 |
1 photo of Olkhonskite associated with Quartz | SiO2 |
1 photo of Olkhonskite associated with Schreyerite | V3+2Ti3O9 |
Related Minerals - Strunz-mindat Grouping
4.CB. | Sassite | Ti3+2Ti4+O5 |
4.CB. | Ferrohögbomite-2N2S | [(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2 |
4.CB. | Magnesiohögbomite-6N12S | Mg5Al11TiO23(OH) |
4.CB. | Griffinite | Al2TiO5 |
4.CB. | Zhenruite | (MoO3)2 · H2O |
4.CB. | Pengite | (Pb8Sb3+3)Σ11Sb5+9O35 |
4.CB. | Virgilluethite | MoO3 · H2O |
4.CB.05 | Brizziite | NaSb5+O3 |
4.CB.05 | Corundum | Al2O3 |
4.CB.05 | Ecandrewsite | (Zn,Fe2+,Mn2+)TiO3 |
4.CB.05 | Eskolaite | Cr2O3 |
4.CB.05 | Geikielite | MgTiO3 |
4.CB.05 | Hematite | Fe2O3 |
4.CB.05 | Ilmenite | Fe2+TiO3 |
4.CB.05 | Karelianite | V3+2O3 |
4.CB.05 | Melanostibite | Mn2+2Fe3+Sb5+O6 |
4.CB.05 | Pyrophanite | Mn2+TiO3 |
4.CB.05 | Akimotoite | (Mg,Fe2+)SiO3 |
4.CB.05 | Auroantimonate | AuSbO3 |
4.CB.05 | UM1998-11-O-AuHSb | Au+2Sb3+O2(OH) |
4.CB.05 | Tistarite | Ti3+2O3 |
4.CB.05 | Unnamed (Fe-Cr Oxide) | FeCrO3 |
4.CB.05 | Hemleyite | (Fe2+0.48Mg0.37Ca0.04Na0.04Mn2+0.03Al0.03Cr3+0.01)sum=1.00Si1.00O3 |
4.CB.10 | Avicennite | Tl2O3 |
4.CB.10 | Bixbyite-(Mn) | Mn3+2O3 |
4.CB.10 | Bixbyite-(Fe) | (Fe,Mn)2O3 |
4.CB.15 | Armalcolite | (Mg,Fe2+)Ti2O5 |
4.CB.15 | Pseudobrookite | Fe2TiO5 |
4.CB.15 | Ferropseudobrookite | Fe2+Ti2O5 |
4.CB.20 | Zincohögbomite-2N2S | [(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(OH)]2 |
4.CB.20 | Zincohögbomite-2N6S | [(Zn,Mg)7(Al,Fe3+,Ti)16O31(OH)]2 |
4.CB.20 | Magnesiohögbomite-6N6S | [(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6 |
4.CB.20 | Magnesiohögbomite-2N3S | [(Mg,Fe2+,Zn)4(Al,Ti,Fe3+)10O19(OH)]2 |
4.CB.20 | Magnesiohögbomite-2N2S | [(Mg,Fe2+)3[Al7(Ti,Fe3+)]O15(OH)]2 |
4.CB.20 | Ferrohögbomite-6N12S | [(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6 |
4.CB.20 | Magnesiohögbomite-2N4S | (Mg8.43Fe2+1.57)sum=10Al22Ti4+2O46(OH)2 |
4.CB.20 | Magnesiobeltrandoite-2N3S | (Mg6Al2)(Al18Fe3+2)O38(OH)2 |
4.CB.20 | Zincovelesite-6N6S | Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH) |
4.CB.25 | Pseudorutile | Fe2Ti3O9 |
4.CB.25 | Kleberite | FeTi6O11(OH)5 |
4.CB.30 | Berdesinskiite | V3+2TiO5 |
4.CB.30 | Oxyvanite | V3+2V4+O5 |
4.CB.30 | Kaitianite | Ti3+2Ti4+O5 |
4.CB.35 | Schreyerite | V3+2Ti3O9 |
4.CB.35 | Machiite | Al2Ti3O9 |
4.CB.35 | Vestaite | (Ti4+Fe2+)Ti4+3O9 |
4.CB.40 | Kamiokite | Fe2Mo3O8 |
4.CB.40 | Nolanite | V3+8Fe3+2O14(OH)2 |
4.CB.40 | Rinmanite | Zn2Sb2Mg2Fe4O14(OH)2 |
4.CB.40 | Iseite | Mn2Mo3O8 |
4.CB.40 | Majindeite | Mg2Mo3O8 |
4.CB.45 | Claudetite | As2O3 |
4.CB.45 | Stibioclaudetite | AsSbO3 |
4.CB.50 | Arsenolite | As2O3 |
4.CB.50 | Senarmontite | Sb2O3 |
4.CB.55 | Valentinite | Sb2O3 |
4.CB.60 | Bismite | Bi2O3 |
4.CB.65 | Sphaerobismoite | Bi2O3 |
4.CB.70 | Sillénite | Bi12SiO20 |
4.CB.75 | Kyzylkumite | V3+Ti2O5(OH) |
4.CB.80 | Tietaiyangite | Fe3+4Fe2+TiO9 |
4.CB.85 | Liuite | FeTiO3 |
4.CB.90 | Luogufengite | Fe2O3 |
4.CB.95 | Wangdaodeite | FeTiO3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Olkhonskite
mindat.org URL:
https://www.mindat.org/min-2985.html
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References for Olkhonskite
Reference List:
Localities for Olkhonskite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| |
Sweden | |
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Ol'khonskiye Vorota Strait, Lake Baikal area, Irkutsk Oblast, Russia