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Formula: PbCo2(AsO4)2.2H2O
Hydrated arsenate,
tsumcorite group,
cobalt-bearing mineral
Crystal System: Monoclinic
Specific gravity: 5.31 calculated
Hardness: 4½
Streak: Light brown
Colour: Brown to red-brown
Environments
Cobalttsumcorite is a secondary mineral found in dump
material from the oxidation zone of polymetallic ore deposits. Associated minerals include
quartz, mawbyite,
cobaltlotharmeyerite,
galena, arseniosiderite and
plumbogummite
(HOM).
Localities
At the type locality, the Roter Berg mining district, Zschorlau, Erzgebirgskreis, Saxony, Germany, Cobalttsumcorite
occurs as brown to yellow rosette-like aggregates, up to 2 mm across, associated with
quartz, mawbyite,
cobaltlotharmeyerite,
galena, arseniosiderite and
plumbogummite in dump material from the oxidation zone
(AM 87.996).
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