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

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.

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

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

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.

Common impurities: Fe3+

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