Wilhelmkleinite Mineral Data

Wilhelmkleinite Mineral Data +

General Wilhelmkleinite Information

Chemical Formula:

ZnFe+++3(AsO4)2(OH)2

Composition:

Molecular Weight = 488.94 gm

Zinc 13.37 % Zn 16.65 % ZnO

Iron 22.84 % Fe 32.66 % Fe₂O₃

Arsenic 30.65 % As 47.01 % As₂O₅

Hydrogen 0.41 % H 3.68 % H₂O

Oxygen 32.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

ZnFe³⁺₂(AsO₄)₂(OH)₂

Environment:

Underground workings (level 44) of the Tsumeb mine in the third oxidation zone,

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

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

Name Origin:

Named after Wilhelm Klein, former mine manager in Anamibia, who made the first systematic collection of minerals from the Tsumeb mine.

Synonym:

ICSD 411044

IMA1997-034

PDF 51-1670

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Wilhelmkleinite Crystallography

Axial Ratios:

a:b:c =0.8712:1:0.9692

Cell Dimensions:

a = 6.631, b = 7.611, c = 7.377, Z = 2; beta = 91.79° V = 372.12 Den(Calc)= 4.36

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 3.385(1), 3.315(0.78), 2.939(0.47),

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Forms: [ 4 3 0] [ 1 0 0] [ 3 1 1]

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Physical Properties of Wilhelmkleinite

Cleavage:

[232] Imperfect

Color:

Blackish green.

Density:

4.34 - 4.63, Average = 4.48

Diaphaniety:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Adamantine

Streak:

green

Optical Properties of Wilhelmkleinite

Gladstone-Dale:

CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2156,KPDmeas= 0.2096,KC= 0.2179

Optical Data:

Biaxial (?), b=1.94

Calculated Properties of Wilhelmkleinite

Electron Density:

r_electron=4.10 gm/cc
note: r_{Wilhelmkleinite}=4.36 gm/cc.

Fermion Index

Fermion Index = 0.01048
Boson Index = 0.98952

Photoelectric:

PE_{Wilhelmkleinite}= 34.96 barns/electron
U=PE_{Wilhelmkleinite} x r_electron= 143.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wilhelmkleinite is Not Radioactive

Wilhelmkleinite Classification

Dana Class:

41.5.19.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.19)Dana Group

41.5.19.1 Wilhelmkleinite ! ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

Strunz Class:

VII/B.08-55 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.08 - Lazulite group, Trolleite - Richellite

VII/B.08-10 Trolleite Al4(PO4)3(OH)3 I2/c 2/m

VII/B.08-20 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-30 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

VII/B.08-40 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-50 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

VII/B.08-55 Wilhelmkleinite ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

VII/B.08-60 Lipscombite (Fe,Mn)Fe2(PO4)2(OH)2 P 4₁2₁2 4 2 2

VII/B.08-70 Richellite Ca3Fe10(PO4)8(OH)12·n(H2O) P 4 4

Other Wilhelmkleinite Information

References:

NAME( AmMin, Vol 84, No. 7-8) PHYS. PROP.(AmMin, Vol. 84, No. 7-8) OPTIC PROP.(AmMin, Vol. 84, No. 7-8)

See Also:

Links to other databases for Wilhelmkleinite :
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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Wilhelmkleinite

ZnFe+++3(AsO4)2(OH)2
Dana No: 41.5.19.1 Strunz No: VII/B.08-55
Locality:

Notes: