Bokite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Bokite
Formula:
(Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O
Colour:
Black
Lustre:
Sub-Metallic, Dull
Hardness:
3
Specific Gravity:
2.97 - 3.1
Crystal System:
Monoclinic
Member of:
Name:
Named in 1963 by E.A. Ankinovich in honor of Ivan Ivanovich Bok (Иван Иванович Бок) (10 October 1898, Belebey, Bashkortostan, Russian Empire - 30 September 1983, Leningrad, USSR), geologist, Institute of Geosciences, Alma-Ata, Kazakhstan and instructor, Sverdlovsk Mining Institute (then Kazakhstan Mining and Metallurgical Institute).
Unique Identifiers
Mindat ID:
709
Long-form identifier:
mindat:1:1:709:0
GUID
(UUID V4):
(UUID V4):
7c3f2341-435c-4016-a94b-d68198a42b64
IMA Classification of Bokite
Approved
First published:
1963
Classification of Bokite
4.HE.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
47.3.2.5
47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
21.4.25
21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni
21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni
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 |
---|---|---|
Bkt | 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 Bokite
Sub-Metallic, Dull
Transparency:
Opaque
Colour:
Black
Streak:
Black, may be brownish black
Hardness:
3 on Mohs scale
Cleavage:
Perfect
parallel to elongation; fair, perpendicular to first direction
parallel to elongation; fair, perpendicular to first direction
Density:
2.97 - 3.1 g/cm3 (Measured) 3.41 g/cm3 (Calculated)
Optical Data of Bokite
Type:
Biaxial
RI values:
nα = 2.010 nγ = 2.060
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Anisotropism:
Strong, brownish yellow to grey-blue
Dispersion:
Relatively weak
Colour in reflected light:
Light grey
Pleochroism:
Strong
Comments:
Dirty olive-green to deep reddish brown
Chemistry of Bokite
Mindat Formula:
(Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O
Crystallography of Bokite
Crystal System:
Monoclinic
Cell Parameters:
a = 11.838(5) Å, b = 3.643(1) Å, c = 11.142(5) Å
β = 110.58(4)°
β = 110.58(4)°
Ratio:
a:b:c = 3.25 : 1 : 3.058
Unit Cell V:
449.84 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Platy to columnar or wedge-shaped grains, to 0.3 mm; reniform crusts with radiating structure; also in veinlets.
Comment:
Point Group: n.d.; Space Group: n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
10.47 Å | (100) |
3.452 Å | (30) |
2.907 Å | (12) |
2.592 Å | (12) |
1.8208 Å | (11) |
3.177 Å | (9) |
2.760 Å | (9) |
Comments:
Recorded on material from the Kurumsak deposit, Kazakhstan
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47e : [Vanadates, chromates, manganates] | |
47h : [Near-surface oxidized, dehydrated minerals] |
Geological Setting:
As a constituent of U-V ores in triassic stream channels and impregnating sandstone
Type Occurrence of Bokite
Co-Type Localities:
General Appearance of Type Material:
Platy to columnar or wedge-shaped grains, to 0.3 mm long,
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA (No. 139767)
Geological Setting of Type Material:
In carbonaceous vanadiferous shales
Associated Minerals at Type Locality:
Reference:
Ankinovich, E.A. (1963) A new vanadium mineral - bokite. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 92: 51-59.
Other Language Names for Bokite
Relationship of Bokite to other Species
Member of:
Other Members of this group:
Bariandite | Al0.6(V5+,V4+)8O20 · 9H2O | Mon. |
Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O | Mon. 2/m : B2/m |
Fernandinite | (Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O | Mon. 2/m : B2/m |
Straczekite | (Ca,K,Ba)(V5+,V4+)8O20 · 3H2O | Mon. 2/m : B2/m |
Common Associates
Associated Minerals Based on Photo Data:
8 photos of Bokite associated with Metatyuyamunite | Ca(UO2)2(VO4)2 · 3H2O |
5 photos of Bokite associated with Mikehowardite | Fe3+4(V5+O4)4(H2O)2 · H2O |
4 photos of Bokite associated with Donowensite | Ca(H2O)3Fe3+2(V2O7)2 |
3 photos of Bokite associated with Sericite | KAl2(AlSi3O10)(OH)2 |
2 photos of Bokite associated with Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
2 photos of Bokite associated with Baryte | BaSO4 |
2 photos of Bokite associated with Roscoelite | K(V3+,Al)2(AlSi3O10)(OH)2 |
1 photo of Bokite associated with Fervanite | Fe3+4V5+4O16 · 5H2O |
1 photo of Bokite associated with Vashegyite | Al11(PO4)9(OH)6 · 38H2O |
1 photo of Bokite associated with Steigerite | Al(VO4) · 3H2O |
Related Minerals - Strunz-mindat Grouping
4.HE.05 | Melanovanadite | Ca(V5+,V4+)4O10 · 5H2O |
4.HE.10 | Shcherbinaite | V5+2O5 |
4.HE.15 | Hewettite | CaV6O16 · 9H2O |
4.HE.15 | Metahewettite | CaV6O16 · 3H2O |
4.HE.20 | Bariandite | Al0.6(V5+,V4+)8O20 · 9H2O |
4.HE.20 | Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
4.HE.20 | Fernandinite | (Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O |
4.HE.20 | Straczekite | (Ca,K,Ba)(V5+,V4+)8O20 · 3H2O |
4.HE.25 | Häggite | V3+V4+O2(OH)3 |
4.HE.30 | Doloresite | V4+3O4(OH)4 |
4.HE.35 | Duttonite | V4+O(OH)2 |
4.HE.40 | Cavoite | CaV4+3O7 |
Other Information
Thermal Behaviour:
Melts at 950 C.
Notes:
Slightly soluble in cold acids with the formation of a pale green solution, dissolves completely in 40% KOH or NaOH. Heated in the closed tube it gives off acid water.
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 Bokite
mindat.org URL:
https://www.mindat.org/min-709.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Bokite
Localities for Bokite
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.
Kazakhstan | |
| Pekov (1998) |
| Ankinovich (1963) +2 other references |
| Ankinovich (1963) +2 other references |
| Pekov (1998) |
USA | |
| Haynes (1991) +1 other reference |
| Howard +1 other reference |
| Anthony (1997) |
| www.prophecydev.com (n.d.) +3 other references |
Castor et al. (2004) | |
Anthony (1997) |
Quick NavTopAbout BokiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Balasauskandyk V Deposit, Shieli District, Kyzylorda Region, Kazakhstan