Mineral description : Malachite

Malachite as a crust.
From Bastnäs.
Malachite ball in a cavity from Pahtohavare.
Formed in the oxidation zone.

Mineral class Calcites : Cerrusite-malachite-hydrozincite group.
Chemical formula Cu2(CO3)(OH)2
Crystal system Monoclinic
Habitus As fibric, radiating needle like crystals. Also as botryidal crusts and compact masses.
Hardness 3.5-4
Density 4.0
Color Green.
Streak Light green.
Description Created as a product of weathering of copper minerals.
Occurance As crusts or massive masses in the oxidation zone of copper ore and minerals.
Associates Copper minerals, Azurite.
Notes Pseudomorphs after azurite is common.
  • In Bastnäs cerite mine, Riddarhyttan, Västmanland. As crusts on chalcopyrite and other rocks.
  • Pahtohavare, Kiruna, Lappland. Massive, fibric and as fibric balls in cavities in the oxidation zone.

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Last changed : 2000-10-22