Sulfides: Bornite
Diagnostic Card.
5 Cu Fe S 4
Crystal system cubic
Hardness 3
Specific gravity 4,9-5,4
Cleavage imperfect
fracture conchoidal
Color: red-brown
Color powder blue-blackish pale
shine metal
Bornite (variegated copper ore), - copper sulphide and iron. Shine metal, opaque. Colour: bronze-yellow to copper-red with bright blue or variegated tarnish. Dash grayish black. Fracture conchoidal. Fragile. Cleavage is imperfect. It is found in magmatic copper-nickel, and particularly hydrothermal stratiform deposits, as well as in the areas of cementation sulfide deposits. The crystals (cubic system) are extremely rare, usually dense fine-grained or discharge mass or film on the primary copper minerals. An important ore of copper. manifestations Places: Germany, Germany, Sweden, England, the CIS, Namibia, the United States.
This mineral forms a granular or dense masses of reddish-brown, rarely - a distinct crystals of cubic, rhombohedral and octahedral shapes. Copper-red, bronze-yellow to reddish purple with blue tarnish.
Diagnostic features.
On air quickly covered with mineral iridescent purple film. Therefore, it is called the purple copper. Chemical composition. Copper (Cu) 55-69% iron (Fe) 11,2%, sulfur (S) 25%; a common impurity silver.
Form crystalline precipitates. Roughly faceted cubes; crystals are rare. The crystal structure. The complex cubic lattice. Class symmetry. Scalenohedral tetragonal - 42m. Cleavage. Rarely seen an imperfect cleavage along (100). Aggregates. Dense, fine.
Origin.
It occurs in hydrothermal veins with chalcopyrite and chalcocite. It may also occur in igneous rocks and pegmatite veins.
Deposits and application.
Known in Butte (Montana, USA), Tsumeb (Namibia), Tamayo (Chile), in Saxony and Silesia (Germany); gorgeous crystals found in Redruth (Kornuoell) in many places in Canada. In Italy, met in Montekanani Val de Cecina in Tuscany, Liguria and Libiole and around Chiavari, and in the Valle d'Aosta and Sardinia Raminoza in Fontana (Province of Nuoro). Bornite - one of the main minerals of copper.
Bornite, chalcopyrite, quartz. Voitsky district to, Segezhsky district, Karelia, Russia. Photo: © AA Evseev.
Bornite, chalcopyrite. Murun massif, Eastern. Siberia, Russia, CIS. 10x4 cm Photo:. © AA Evseev.
Bornite in quartz. Kyzyl-veil, Tuva, south Avg. Siberia, Russia, CIS. Photo: © AA Evseev.
Bornite (to friends). Dzhezkazgan, Kazakhstan. Srndnyaya Asia, CIS
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