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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(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.).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Mineral Cuprite. Retrieved August 1, 2017, from b.
The results can be clearly seen from different methods on recovery Cuprite, as shown in Table 1.
In the Holy Ambrogio altar, the team found "microcracks and a dense population of cuprite ([Cu.sup.2]O) microglobules that formed during the manufacturing of the panel." The researchers found other cracks as well, which they attributed to brittleness caused by the aging of the ancient silver.
Mapping of hydrothermal alteration in the Cuprite Mining District, Nevada, using aircraft scanner images for the spectral region 0.46 to 2.36pm.
their malachite gifts, azurite, cuprite, fool's gold,
Supergene mineralisation is wide spread, with chalcocite, malachite and cuprite as the main secondary minerals.
In particular, the black surface of Japanese Shakado is associated with the establishment of a layer of a copper oxide, cuprite, which is modified by a relatively small concentration of gold and silver in a manner which subtly modifies its natural colour.(15)
Although copper moves freely in nature in small quantities, it exists especially as red cuprite [Cu.sub.2]O, halkosit [Cu.sub.2]S, gold-bright halkopirit CuFe[S.sub.2], bornit [Cu.sub.3]Fe[S.sub.3], bright-green malachite [Cu.sub.2][(OH).sub.2]C[O.sub.3] and dark blue azurite [Cu.sub.3][(OH).sub.2][(C[O.sub.3]).sub.2] in nature (6).
The 10-cm specimen shows brilliant green acicular crystals of atacamite to 3 cm forming tight sprays which fill a cavity in massive cuprite. Jordi ( says that this is the best of about 15 such specimens found last year at the collecting site.