Buttgenbachite

minerals

cuprite

likasite

gerhardtite

Formula: Cu36(NO3)2Cl8(OH)62.nH2O
Nitrate containing halogen, forms a series with connellite
Specific gravity: 3.42
Hardness: 3
Streak: Light blue
Colour: Deep blue; blue in transmitted light
Solubility: Soluble in acids and in ammonium hydroxide, insoluble in water
Environments

Hydrothermal environments

Buttgenbachite is a rare secondary mineral found in the oxidised portions of copper deposits; the nitrate may be of biological origin. Associated minerals include cuprite, likasite, gerhardtite, malachite, brochantite and silver (HOM).

Localities

At the type locality, the Likasi Mine, Likasi, Kambove District, Haut-Katanga, DR Congo, buttgenbachite is found as flat needles about 1 mm in length in a cavity in cuprite associated with native silver (AM 11.216).

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