Cobaltomenite

cobaltomenite

chalcomenite

molybdomenite

clinochalomenite

Images

Formula: Co(Se⁴⁺O₃).2H₂O
Selenite, cobalt-bearing mineral, forms a series with ahlfeldite
Crystal System: Monoclinic
Specific gravity: 3.42 measured, 3.422 calculated using synthetic material
Hardness: 2 to 2½
Streak: Dark pink
Colour: Dark red, pink-red, brownish pink, yellowish brown
Environments

Hydrothermal environments

Cobaltomenite occurs as a secondary mineral in the oxidation zone of hydrothermal selenium-sulphide bearing vein deposits (HOM).

Localities

At the type locality, Cerro de Cacheuta, Sierra de Cacheuta, Cacheuta District, Luján de Cuyo department, Mendoza Province, Argentina, cobaltomenite is associated with chalcomenite and molybdomenite (HOM).

At El Dragón mine, Porco Municipality, Antonio Quijarro Province, Potosí, Bolivia, cobaltomenite is associated with chalcomenite, clinochalcomenite, lepidocrocite and gypsum (HOM).

Back to Minerals