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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)
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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