Hydrated normal arsenate, tsumcorite group
Hardness: 4 to 5
Colour: Green, Bluish-green, olive-green
Thometzekite is a very rare secondary mineral.
At the type locality, the Tsumeb mine, Tsumeb, Oshikoto Region, Namibia, thometzekite was found in an oxidised zone in a dolostone-hosted hydrothermal polymetallic ore deposit on a specimen of massive gypsum. Associated minerals include anglesite and mimetite, as well as gypsum (HOM, AM 73.931).
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