Hydrated normal arsenate
Specific gravity: 5.2
Colour: Yellow-brown, red-brown, orange
Common impurities: Fe3+
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
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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