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Formula: ZnFe3+2(AsO4)2(OH)2
Arsenate, lazulite group,
zinc-bearing mineral
Crystal system: Monoclinic
Specific gravity: 4.364 calculated
Hardness: 4½
Streak: Green
Colour: Blackish green
Environments
Although wilhelmkleinite was approved in 1997, to date (September 2025) it has been reported only from the
type locality; it is a very rare mineral.
Localities
At the type locality, the Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia, wilhelmkleinite occurs as blackish
green, spearhead-shaped crystals up to 5 mm long, in a deep oxidation zone in the
dolostone-hosted hydrothermal polymetallic ore deposit. Associated
minerals include scorodite,
gerdtremmelite and adamite
(HOM, Mindat).
Wilhelmkleinite from the Tsumeb Mine -
Image
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