Sulphides: Enargit
Diagnostic card.
Cu 3 As S 4
Diamond orthogonality
Hardness 3
Specific weight 4,43-4,45
Cleavage is perfect
Fracture irregular and conchoidal
Black color
Glitter metal
Usually dense or granular, often represented by prismatic crystals, characteristic black-gray color, sometimes with iridescent surface film.
Chemical composition. Copper (Cu) 48.4%, arsenic (As) 19.0%, sulfur (S) 32.6%. The shape of the crystals. Columnar, on the faces of vertical hatching, less often tabular. Crystal structure. It is similar to the wurtzite structure. Class of symmetry. Rhombo-pyramidal-mm2. Cleavage. Perfect by (110). Aggregates. Dense masses, spat-like aggregates or phenocrysts.
Diagnostic signs.
Is liable to the action of nitric acid; At the same time, sulfur flakes are released. When heated, produces a characteristic smell of garlic. On the coal melts to form a white jack of oxide of trivalent arsenic.
Origin.
Mineral is not too common. It occurs in primary deposits in association with bornite, pyrite, sphalerite, quartz, barite and other minerals.
Deposits and applications.
Along with pyrite, bornite, tennantite, luconite, it is found in the deposits: Rechk (Hungary), Brixlegg in the Austrian Tyrol, Bor in Serbia, in the form of continuous masses and unusual crystals in Butte (Montana, USA). Fine crystals are found in Cerro de Pasco and Kirivilka in Peru, Chikikamata in Chile, Sierra de Famatina in Argentina, Chilung (Taiwan). In Italy, good crystals (up to 1-2 cm) are found together with pyrite and covellite in Calabon (Sardinia). Very small crystals are found in the abandoned mine Torrebeljevicino, Vicenza province. Used to produce copper and arsenic.
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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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