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cuprite

cuprite (red copper ore) Mineral, Cu2O; sp. gr. 5.8–6.1; hardness 3.5–4.0 cubic; red to nearly black; brownish-red streak; adamantine to sub-metallic lustre; crystals usually octahedral and acicular, but can be granular and rhombododecahedral; cleavage poor {111}; usually occurs in the oxidized zone of copper deposits, as a secondary mineral, and associated with malachite and azurite. It is a minor ore mineral for copper.

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cuprite

cuprite Reddish-brown, brittle, translucent oxide mineral, cuprous oxide (Cu2O). Formed by the oxidation of other ores, such as copper sulphide, it is an important source of copper.

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