Biehlite Mineral Data

Biehlite Mineral Data

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General Biehlite Information

Chemical Formula:

(Sb,As)2MoO6

Composition:

Molecular Weight = 426.07 gm

Antimony 51.44 % Sb 61.57 % Sb₂O₃

Molybdenum 22.52 % Mo 33.78 % MoO₃

Arsenic 3.52 % As 4.64 % As₂O₃

Oxygen 22.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sb_1.8As_0.2MoO₆

Environment:

Associated with angelsite and wulfenite on a fine-grained Cu ore in the oxidation zone of the deposit.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for Friedrich Karl Bielh (1887-?), who was the first to do scientific work on the mineralization of the Tsumeb deposit.

Synonym:

ICSD 411401

IMA1999-019a

Biehlite Image

Images:

Biehlite

Comments: White fibrous crystals of biehlite.
Location: Tsumeb, Namibia. Scale: Picture size 8 mm.
© Thomas Witzke / Abraxas-Verlag

Biehlite Crystallography

Axial Ratios:

a:b:c =3.0533:1:0.8586

Cell Dimensions:

a = 18.076, b = 5.92, c = 5.083, Z = 4; beta = 96.97° V = 539.91 Den(Calc)= 5.24

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 2.96(1)(020), 2.99(1)(600), 5.622(0.65)(110),3.104(0.61)(311), 2.104(0.42)(620), 3.376(0.3)(311), 1.962(0.32)(130),

Crystal Structure:

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Adiwidjaja G , Friese K , Klaska K H , Schluter J , Czank M , Zeitschrift fur Kristallographie , 215 (2000) p.529-535, Crystal structure and crystal chemistry of biehlite, Sb1.79As0.21MoO6, Locality: Tsumeb mine Namibia

Physical Properties of Biehlite

Color:

White.

Diaphaniety:

Translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1-1.5 - Talc or a little harder

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Biehlite

Gladstone-Dale:

CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2195,KC= 0.216

Optical Data:

Biaxial (?), b=2.15

Calculated Properties of Biehlite

Electron Density:

r_electron=4.63 gm/cc
note: r_Biehlite=5.24 gm/cc.

Fermion Index

Fermion Index = 0.05745
Boson Index = 0.94255

Photoelectric:

PE_Biehlite= 212.55 barns/electron
U=PE_Biehlite x r_electron= 984.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Biehlite is Not Radioactive

Biehlite Classification

Dana Class:

48.2.4.1 (48)Anhydrous Molybdates and Tungstates

(48.2)where (A)2 XO4

(48.2.4)Dana Group

48.2.4.1 Biehlite ! (Sb,As)2MoO6 C 2/c 2/m

Strunz Class:

VI/G.02-05 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/G - Molybdates [MoO4]2- and wolframates [WO4]2-

VI/G.02 - Lindgrenite - Phyllotungstite series

VI/G.02-05 Biehlite (Sb,As)2MoO6 C 2/c 2/m

VI/G.02-10 Lindgrenite Cu3(MoO4)2(OH)2 P 2₁/n 2/m

VI/G.02-15 Szenicsite Cu3MoO4(OH)4 Pnnm, Pnn2 Ortho

VI/G.02-20 Cuprotungstite Cu3(WO4)2(OH)2 Unk Tetra

VI/G.02-25 Vergasovaite! Cu3O[(Mo,S)O4][SO4] P nma 2/m 2/m 2/m

VI/G.02-30 Ferrimolybdite Fe2(MoO4)3·8(H2O) Unk Ortho

VI/G.02-40 Phyllotungstite CaFe3H(WO4)6·10(H2O) P 222,Pmm2,P mmm Ortho

Other Biehlite Information

References:

NAME( AmMin, Vol 86) PHYS. PROP.(AmMin, Vol 86) OPTIC PROP.(CanMin, Vol 38)

See Also:

Links to other databases for Biehlite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

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Biehlite

(Sb,As)2MoO6
Dana No: 48.2.4.1 Strunz No: VI/G.02-05
Locality:

Notes: