Spherocobaltite

minerals

heterogenite

carrollite

Formula: Co(CO3)
Anhydrous normal carbonate, calcite group
Specific gravity: 4.13
Hardness: 3 to 4
Streak: Pink
Colour: Rose red, altering to grey, brown or velvet back
Solubility: Slowly soluble in cold hydrochloric acid. Rapidly soluble in hot acids with effervescence.
Common impurities: Ca,Ni,Fe,O
Environments

Hydrothermal environments

Spherocobaltite is a rare accessory mineral in hydrothermal cobalt-bearing mineral deposits with oxidised zones containing carbonates. Associated minerals include carrollite, chrysocolla, cobaltoan calcite, cobaltoan dolomite, heterogenite and malachite (Mindat).

Localities

At the Kambove District, Haut-Katanga, DR Congo, spherocobaltite is associated with cobaltoan calcite and cobaltoan dolomite (HOM).

At the L'Etoile du Congo mine, Lubumbashi, Haut-Katanga, DR Congo, spherocobaltite occurs in dolostone (Dana).

At the type locality, the Daniel mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany, spherocobaltite occurs in cobalt-nickel veins associated with roselite, erythrite and annabergite (HOM, Dana, Mindat ).

Alteration:

Spherocobaltite alters to heterogenite (Mindat).

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