Bokite Mineral Data + 
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- 47.3.2.1 Straczekite (Ca,K,Ba)2V8O20·3(H2O) C 2/m 2/m
- 47.3.2.2 Corvusite (Na,Ca,K)V8O20·4(H2O) C 2/m 2/m
- 47.3.2.3 Fernandinite CaV8O20·4(H2O) C 2/m 2/m
- 47.3.2.4 Bariandite Al0.6V8O20·9(H2O) C 2/c 2/m
- 47.3.2.5 Bokite (Al,Fe)1.3(V,Fe)8O20·4.7(H2O) C 2/m 2/m
- 47.3.2.6 Kazakhstanite Fe5V3V12O39·8.5(H2O) C 2/m 2/m
- IV/G.11-10 Bariandite Al0.6V8O20·9(H2O) C 2/c 2/m
- IV/G.11-20 Bokite (Al,Fe)1.3(V,Fe)8O20·4.7(H2O) C 2/m 2/m
- IV/G.11-30 Straczekite (Ca,K,Ba)2V8O20·3(H2O) C 2/m 2/m
- IV/G.11-35 Fernandinite CaV8O20·4(H2O) C 2/m 2/m
- IV/G.11-40 Corvusite (Na,Ca,K)V8O20·4(H2O) C 2/m 2/m
General Bokite Information |
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 Chemical Formula: |
(Al,Fe+++)1.3(V++++,Fe)8O20·4.7(H2O) | ||
| Composition: |
Molecular Weight = 858.38 gm | ||
| Aluminum 3.14 % Al 5.94 % Al2O3 | |||
| Vanadium 44.51 % V 79.46 % V2O5 | |||
| Iron 5.20 % Fe 7.44 % Fe2O3 | |||
| Hydrogen 1.10 % H 9.86 % H2O | |||
| Oxygen 46.04 % O | |||
| ______ ______ | |||
| 100.00 % 102.70 % = TOTAL OXIDE | |||
| Empirical Formula: |
AlFe3+0.3V5+7.5Fe3+0.5O20·4.7(H2O) | ||
| IMA Status: |
Approved IMA 1963 | ||
| Locality: |
Kurumsak area, Kazakhstan. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Ivan I. Bok, (1898-), Kazakh mineralogist. | ||
Bokite Image | |||
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Bokite Crystallography |
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| Axial Ratios: |
a:b:c =3.2495:1:3.0584 | ||
| Cell Dimensions: |
a = 11.838, b = 3.643, c = 11.142, Z = 1; beta = 110.58° V = 449.84 Den(Calc)= 3.17 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 10.47(1), 3.452(0.3), 2.907(0.12), | ||
Physical Properties of Bokite |
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| Cleavage: |
[???] Perfect | ||
| Color: |
Black. | ||
| Density: |
2.97 - 3.1, Average = 3.03 | ||
| Diaphaniety: |
Opaque | ||
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. | ||
| Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) | ||
| Habit: |
Reniform - "Kidney like" in shape (e.g.. hematite). | ||
| Hardness: |
3 - Calcite | ||
| Luster: |
Metallic - Dull | ||
| Streak: |
brownish black | ||
Optical Properties of Bokite |
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| Gladstone-Dale: |
CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.3265,KPDmeas= 0.341,KC= 0.3394 |
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| Optical Data: |
Biaxial (?), a=2.01, g=2.06, bire=0.0500 | ||
| Pleochroism (x): |
dirty olive green. | ||
| Pleochroism (y): |
deep red brown. | ||
| Pleochroism (z): |
deep red brown. | ||
Calculated Properties of Bokite |
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| Electron Density: |
relectron=2.92 gm/cc |
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| Fermion Index |
Fermion Index = 0.00243 Boson Index = 0.99757 |
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| Photoelectric: |
PEBokite = 10.19 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Bokite is Not Radioactive |
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Bokite Classification |
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| Dana Class: |
47.3.2.5 (47)Vanadium Oxysalts | ||
| (47.3)(Hydrated) | |||
| (47.3.2)Dana Group | |||
| Strunz Class: |
IV/G.11-20 IV - Oxides | ||
| IV/G - Vanadiumoxides (with V4+/5+) Layered vanadates. Typical Vanadiumbronzes | |||
| IV/G.11 - Bariandite - Corvusite-? series | |||
Other Bokite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Bokite : 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 Search for Bokite using: Visit our Advertisers for Bokite : Translate Bokite Mineral Data : Ask about Bokite here : Print or Cut-and-Paste your Bokite Specimen Label here :
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