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Cu2O A red mineral that crystallizes in the isometric system and is found in crystals and fine-grained aggregates or is massive; a widespread supergene copper ore. Also known as octahedral copper ore; red copper ore; ruby copper ore.



(also ruby copper, red copper ore), a mineral; cuprous oxide, Cu2O (88.8 percent Cu, 11.2 percent O). Cuprite crystallizes in the isometric system. The crystals are octahedral, dodecahedral or, less frequently, acicular or fibrous (chalcotrich-ite). The mineral generally occurs in massive granular, sometimes earthy, aggregates. Cuprite is red in color with a high adamantine luster. Its hardness on Mohs’ scale is 3.5–4 and its density is 5,850–6,200 kg/m3.

Cuprite is a typical supergene mineral formed from primary copper sulfides and secondary chalcocite. It occurs in association with malachite, native copper, and other secondary minerals in the oxidation zone of copper deposits. In the USSR, cuprite deposits are located in the Urals (Gumeshki, Mednaia Ruda, and Turiia mines) and in the Kazakh SSR (Dzhezkazgan). There are also deposits in France (Chessy, near Lyon), Chile, Peru, and the United States (Bisbee, Ariz.).

References in periodicals archive ?
Oxide mineralization was noted to 212m depth and comprises veinlets and disseminated malachite, azurite, cuprite, limonite and chrysocolla.
The base of oxidation was noted at 451m depth and oxide mineralization comprises occasional native copper, cuprite and pitch limonite, whereas the underlying hypogene sulphide zone is characterized by pyrite, chalcopyrite and minor bornite.
Oxide mineralization comprises limonite, azurite, malachite cuprite and native copper.
Oxide mineralization consists of cuprite, pitch limonite, chrysocolla, neotocite, malachite and native copper.
Oxide mineralization comprises minor limonite and cuprite.
Oxide mineralization consists predominantly of weak cuprite, azurite, malachite, native copper, and occasional limonite veinlets.
Oxide mineralization consists predominantly of cuprite with rare malachite, and occasional limonite veinlets.
Oxide mineralization consists of cuprite, azurite, malachite, chrysocolla and minor native copper.
Oxide mineralization comprises minor cuprite, azurite, malachite, pitch limonite and native copper as fracture fillings, disseminations and quartz vein fillings.
Oxide mineralization consisting of cuprite, native copper and trace neotocite is associated with weak quartz veining to the base of oxidation at 338m depth.
Oxide copper mineralization is associated with 1-2% quartz veining and comprises cuprite, malachite, azurite and limonite increasing with depth.
The intensity of mineralization generally decreases below 500m and comprises quartz-limonite veinlets, azurite, malachite, cuprite, and minor chrysocolla.