Oxides and hydroxides: Cuprite
Diagnostic card.
In the photo: crystals of cuprite in geode. Bottom: dendritic aggregate of bright red color of cuprite with marcasite (Arizona).
Cu 2 O (copper oxide)
Cubic amount of cubic zirconia
Hardness 3,5-4
Specific weight 6,14
Cleavage in the cube, bad
Fracture is conchoidal or irregular
Color carmine-red, brown-red
Color in powder brown-red
Gloss semi-metallic to earthy
Kuprit (red copper ore), copper oxide. Shine diamond to metal; Opaque to transparent. The color is brownish-red, from the surface - lead gray. The dash is red. The fracture is uneven, up to the shell. It's fragile. Cleavage is clear. Occurs in the oxidation and cementation zones of sulfide deposits. Crystals (cubic syngony) are represented by octahedra, more dense solid aggregates are more common. A useful component of copper ores. "Copper flowers" - sputanno-fibrous aggregates of needle crystals, a kind of cuprite "brick ore" - a mixture of cuprite and limonite. Venues of manifestation: France, Spain, Chile, Peru, USA, Namibia, CIS.
Kuprit - fragile, with very poor cleavage, is represented by dense masses, but there are also transparent or translucent crystals. They are almost always bright red, but are also found in a muted red color. Luster is diamond, semimetallic. A variety with strongly elongated crystals, formed during a strong transformation of an elongated cube, is called chalcotrichite.
Name: in composition from the Latin "koprum" - copper. The impurities are Fe2O3, SiO2, ZnO, PbO, CaO, excess Cu (due to minute inclusions of native copper), H2O.
Diagnostic signs.
Very often crystals and dense masses of cuprite are covered with a green coating or a crust of malachite. If you melt a small piece of mineral on a candle flame, it's easy to get a metallic copper ball.
Origin.
Kuprit is found mainly in the oxidation zone of copper deposits. Associated there with native copper, malachite and azurite.
Deposits and applications.
Of the many existing deposits, exceptional crystals are known from the African Shaba mines (in Zaire) and Tsumeb (Namibia). Kuprite is one of the first natural materials that has been used by man to produce copper in a relatively simple way of melting.
Volost-like aggregates of cuprite (chalcotrichite). China. (2011).
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Poisonous and radioactive dangerous stones and minerals
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** - radioactive stones and minerals (mandatory check on the standard dosimeter + ban on open sales in case of radioactivity exceeding 24 milli / g / h + additional measures of population protection)
Catalog of minerals and semi-precious stones of the world by groups
** - poisonous stones and minerals
** - radioactive stones and minerals
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