Bokite Mineral Data

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 - Prismatic H-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

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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:

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