Wilhelmkleinite

General Information:
 Chemical Formula:
ZnFe+++3(AsO4)2(OH)2
 Composition:
(Molecular Weight = 488.94 gm)
Zinc 13.37 % Zn
Iron 22.84 % Fe
Arsenic 30.65 % As
Hydrogen 0.41 % H 
Oxygen 32.72 % O 
 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:
TL: Tsumeb mine, Namibia.
 Name Origin:
Named after Wilhelm Klein, former mine manager in Anamibia, who made the first systematic collection of minerals from the Tsumeb mine.
Physical Properties:
 Cleavage:
[232] Imperfect
 Color:
blackish green.
 Density:
4.34 - 4.63, Average = 4.48
 Diaphaniety:
Translucent
 Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., ,
 Hardness:
4.5 - Between Fluorite and Apatite
 Luminescence:
Non-fluorescent.
 Luster:
Adamantine
 Streak:
green
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