Tsumcorite

tsumcorite

mimetite

helmutwinklerite

stranskiite

Images

Formula: PbZn2(AsO4)2.2H2O
Hydrated normal arsenate
Specific gravity: 5.2
Hardness: 4½
Streak: Yellow
Colour: Yellow-brown, red-brown, orange
Solubility:
Common impurities: Fe3+
Environments:

Hydrothermal environments

Tsumcorite is a rare secondary mineral in the oxidised zone of some arsenic-bearing hydrothermal lead-zinc deposits. It forms a series with helmutwinklerite and thometzekite (Webmin).

Localities

At the Puttapa mine, South Australia, tsumcorite is associated with adamite, mimetite, smithsonite, goethite and quartz (HOM).

Tsumcorite has been found in a sample from Thrasos, Greece, in the British museum collection (AM 57.1558).

At the type locality, the Tsumeb Mine, Namibia, tsumcorite is found in the oxidised zone associated with willemite, smithsonite, mimetite, scorodite, anglesite, arseniosiderite, beaverite, beudantite, carminite, ludlockite, o’danielite, zincroselite, stranskiite and leiteite (HOM). Pseudomorphs of tsumcorite after mimetite have been found here (KL p198).



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