Arsenate, brackebuschite group
Specific gravity: 6.52 calculated
Hardness: 4 to 5
Colour: Pale olive green
At the type locality, the Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia, is a very rare
secondary mineral which was found as radiating globular masses with a
goethite core, in a cavity about 2cm wide in chalcocite,
in an oxidized zone in a dolostone-hosted hydrothermal polymetallic ore deposit.
Associated minerals include goethite, anglesite,
arsendescloizite and gypsum
(AM 83.653-654, Hom, Mindat).
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