Bokite Mineral Data

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General Bokite Information

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.

Name Pronunciation:

Bokite

Bokite Image

Images:

Bokite

Comments: Dark brown micro crystal rosettes of bokite in matrix.
Location: Monument #2 Mine, Apache County, Arizona. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Bokite

Comments: Tannish "spots" as very micro acicular bokite crystals filling in between grains. Eaton Collection.
Location: Monument #2 mine, Apache Co.,, Arizona, USA. Scale: Picture size 0.5 cm.
© Tom Loomis / Dakota Matrix

Bokite Crystallography

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

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

By Intensity(I/I_o): 10.47(1), 3.452(0.3), 2.907(0.12),

Physical Properties of Bokite

Cleavage:

{???} Perfect

Color:

Black.

Density:

2.97 - 3.1, Average = 3.03

Diaphaneity:

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

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
Ncalc = 2.01 - 2.08

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

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Bokite =3.04 gm/cc.

Fermion Index:

Fermion Index = 0.0024388124
Boson Index = 0.9975611876

Photoelectric:

PE_Bokite= 10.19 barns/electron
U=PE_Bokite x rElectron Density= 29.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bokite is Not Radioactive

Bokite Classification

Dana Class:

47.03.02.05 (47)Vanadium Oxysalts

(47.03)(Hydrated)

(47.03.02)Straczekite Group

47.03.02.01 Straczekite (Ca,K,Ba)(V5,V4)8O20•3H2O C 2/m 2/m

47.03.02.02 Corvusite (Na,Ca,K)V8O20•4(H2O) C 2/m 2/m

47.03.02.03 Fernandinite CaV8O20•4(H2O) C 2/m 2/m

47.03.02.04 Bariandite Al0.6V8O20•9(H2O) C 2/c 2/m

47.03.02.05 Bokite (Al,Fe)1.3(V,Fe)8O20•4.7(H2O) C 2/m 2/m

47.03.02.06 Kazakhstanite Fe5V3V12O39(OH)9•9(H2O) C 2/m 2/m

Strunz Class:

04.HE.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.H - V[5,6] Vanadates

04.HE -Phyllovanadates

04.HE.20 Bokite (Al,Fe)1.3(V,Fe)8O20•4.7(H2O) C 2/m 2/m

04.HE.20 Bariandite Al0.6V8O20•9(H2O) C 2/c 2/m

04.HE.20 Corvusite (Na,Ca,K)V8O20•4(H2O) C 2/m 2/m

04.HE.20 Fernandinite CaV8O20•4(H2O) C 2/m 2/m

04.HE.20 Straczekite (Ca,K,Ba)(V5,V4)8O20•3H2O C 2/m 2/m

Other Bokite Information

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 - 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 Bokite using:

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Visit our Advertisers for Bokite :

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John Betts Fine Minerals Search for Bokite
McDougall Minerals Google Search for Bokite
Mineral News Website Link
Rock and Mineral Shows Google Search for Bokite
Weinrich Minerals, Inc. Google Search for Bokite

Ask about Bokite 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 Español

Print or Cut-and-Paste your Bokite Specimen Label here :

Bokite

(Al,Fe+++)1.3(V++++,Fe)8O20•4.7(H2O)
Dana No: 47.03.02.05 Strunz No: 04.HE.20
Locality:

Notes: