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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 a depth of 396m and comprises malachite, azurite, cuprite and native copper.
5 cm rising from massive red cuprite, have recently emerged as well.
The original deposit possessed a leached capping of oxide ore averaging some 27 m in thickness, the principal minerals being malachite, azurite, cuprite, tennantite, brochantite, antlerite and chrysocolla.
Cuprite disseminations and fracture fillings associated with the underlying basalts suggest possible copper-gold mineralization at depth.
Some surfaces show brick-red cuprite patinas, while others show dull black patinas of tenorite; the color and luster of the uncoated native metal is fairly bright, but the two other tints add variety and aesthetic interest to these fine copper specimens.
The mineralization at Amethyst Castle comprises dominantly malachite, azurite and subordinate chrysocolla in an oxide zone underlain by a primary zone of chalcopyrite and chalcocite, with cuprite and bornite (all of which are copper minerals) defining a transitional zone.
His booth was large and fine, featuring a whole case of excellent French minerals, several of which were already reserved, including a fine Chessy malachite pseudomorph after cuprite, almost 2 centimeters
The base of oxidation was logged at 349m depth and oxide mineralization comprises occasional pitch limonite, localized cuprite and fine native copper.
2003) This study Azurite X X Barite X Brochantite X X Chalcocite X X Chalcanthite X Chrysocolla X X Copper X X Covellite X Cuprite X X Delafossite X Malachite X X Neotocite X Plancheite X Tenorite ("melaconite") X X
The base of oxidation was logged at 359m and oxide mineralization comprises limonite, hematite, cuprite and native copper.
Since then Ray has been a prolific producer of native copper specimens, as well as exceptional crystals of cuprite and large chrysocolla pseudomorphs.
The base of oxidation was logged at 462m and oxide mineralization comprises cuprite, azurite, malachite, native copper and chalcocite.