Formula: Cu2+3Zn4Cd2(AsO4)6.2H2O
Hydrated normal arsenate, alluaudite group, zinc and copper mineral
Specific gravity: 5.106
Hardness: 3½ to 4
Streak: Light blue
Colour: Blue
Solubility: Readily dissolved in concentrated acids (AM 62.1259)

Hydrothermal environments

Keyite is a rare secondary mineral that has been found in the oxidised zone of a dolostone-hosted hydrothermal polymetallic ore deposit, associated with cuprian adamite, schultenite, metazeunerite, zincian olivenite and tennantite (HOM).

At the type locality, the Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia, keyite has been found in cavities in tennantite ore associated with schultenite and zincian olivenite (Dana, AM 62.1259).

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