Mineralogy Database

Bokite Mineral Data

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General Bokite Information

Help on Chemical  Formula: Chemical Formula: (Al,Fe+++)1.3(V++++,Fe)8O20•4.7(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: AlFe3+0.3V5+7.5Fe3+0.5O20•4.7(H2O)
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: Kurumsak area, Kazakhstan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ivan I. Bok, (1898-), Kazakh mineralogist.
Help on Name Pronunciation: Name Pronunciation: Bokite Say BOKITE

Bokite Image

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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

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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

Help on Axial Ratios: Axial Ratios: a:b:c =3.2495:1:3.0584
Help on Cell Dimensions: Cell Dimensions: a = 11.838, b = 3.643, c = 11.142, Z = 1; beta = 110.58° V = 449.84 Den(Calc)= 3.17
Help on Crystal System: 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/Io): 10.47(1), 3.452(0.3), 2.907(0.12),

Physical Properties of Bokite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Black.
Help on Density: Density: 2.97 - 3.1, Average = 3.03
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Metallic - Dull
Help on Streak: Streak: brownish black

Optical Properties of Bokite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (?), a=2.01, g=2.06, bire=0.0500
Help on Pleochroism (x): Pleochroism (x): dirty olive green.
Help on Pleochroism (y): Pleochroism (y): deep red brown.
Help on Pleochroism (z): Pleochroism (z): deep red brown.

Calculated Properties of Bokite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Bokite =3.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0024388124
Boson Index = 0.9975611876
Help on Photoelectric: Photoelectric: PEBokite = 10.19 barns/electron
U=PEBokite x rElectron Density= 29.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bokite is Not Radioactive

Bokite Classification

Help on  Dana Class: Dana Class: (47)Vanadium Oxysalts
  (47.03.02)Straczekite Group Straczekite (Ca,K,Ba)(V5,V4)8O20•3H2O C 2/m 2/m Corvusite (Na,Ca,K)V8O20•4(H2O) C 2/m 2/m Fernandinite CaV8O20•4(H2O) C 2/m 2/m Bariandite Al0.6V8O20•9(H2O) C 2/c 2/m Bokite (Al,Fe)1.3(V,Fe)8O20•4.7(H2O) C 2/m 2/m Kazakhstanite Fe5V3V12O39(OH)9•9(H2O) C 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 04.HE.20





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