malachite - student specimens of fibrous malachite from the Congo - Unit of 5 specimens.
Malachite, Cu2CO3(OH)2, is an important carbonate ore of copper.
Malachite occurs in the oxidized portion of copper veins, in association with azurite, cuprite and iron oxides. Its bright green color and effervescence in dilute hydrochloric acid are diagnostic. Today, the best specimens of malachite come from the Congo.
These specimens were collected from the Kalukuluku Mine, renamed l' Étoile du Congo (Star of the Congo) by the Belgians, a copper mine on the outskirts of Lubumbashi, Haut-Katanga Province, Democratic Republic of Congo. The mine is worked occasionally and by locals for mineral specimens.
These specimens are more expensive than what we prefer, and somewhat smaller, but are more than adequate student specimens of fibrous malachite.
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