Brochantite - Natural minerals and crystals

Brochantite is a hydrated copper sulphate with the chemical formula Cu₄(SO₄)(OH)₆, belonging to the monoclinic crystal system. This secondary mineral typically forms in the oxidation zone of copper deposits, resulting from the supergene alteration of primary sulphides such as chalcopyrite or bornite. Crystallographically, brochantite has a hardness of 3.5 to 4 on the Mohs scale and a density of around 3.97. Its crystals, often prismatic or acicular, can form drusy aggregates of striking aesthetic appeal. The vitreous to silky lustre of this mineral, combined with its variable transparency, makes it a highly prized mineralogical specimen. The most notable deposits are found in Chile and Arizona, as well as in Namibia and the Russian Urals, regions where geological conditions favour its optimal crystallisation. A relatively rare mineral, brochantite stands out for its major scientific interest in the study of mineral alteration processes and copper mineralogy. Gem-quality specimens, displaying fine transparency and well-formed crystals, make choice pieces for any serious mineralogical collection, bearing witness to the richness and diversity of the mineral world.

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