Mineral description : Azurite

Azurite from Bastnäs, Riddarhyttan.
Dark blue azurite with malakite from Viscaria.

Mineral class Carbonates : Cerussite - malachite - hydrozinkite group
Chemical formula Cu3(OH/CO3)2
Crystal system Monoclinic
Habitus As tabular or short prismatic crystals or as radiating aggregates. Also forming massive and earthy crusts
Cleavage Perfect, fracture conchoidal.
Hardness 3.5-4
Density 3.77-3.83
Color Blue, from deep blue crystals to somewhat lighter crusts.
Streak Pale blue.
Luster Vitreous to dull.
Description This mineral is one of the first sources of copper ore, mined together with malachite for about 8000 years ago in Bulgaria.
Heated in a fire it produces metallic copper.
Occurance Forms as a secondary mineral in the oxidizing zone of copper deposits.
Associates Malachite, various copper sulphides.
Notes Soluble in hydrocloric acid forming bubbles.
Fuses easily while turning black.
Locations Relatively common in Sweden in sulphide mines.
  • Riddarhyttan, Västmanland. (Bastnäs) As thin earthy coatings.
  • Falu copper mine.
  • In many manganeese mines in Värmland.

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Last changed : 1998-04-01