Sulfides: Chalcocite
Diagnostic Card.
Cu 2 S (copper sulphide)
Crystal system orthorhombic
Hardness of 2.5-3
Specific gravity 5,5-5,8
Cleavage is perfect
Color dark gray iron with glitter
Color powder dark gray, shiny
shine metal
Chalcocite (copper luster), - copper sulphide. Shine metal, opaque. Colour lead-gray. The bar is dark gray. Fracture conchoidal, uneven. Cleavage is imperfect. It is found in the zone of cementation of copper sulphide deposits and copper-bearing shales. Crystals (orthorhombic system) are rare, increasingly dense assemblies and earthy masses. Important copper ore. Deposits: Germany, Spain, Yugoslavia, England, CIS, Shaba (Zaire), Namibia, the United States.
Another name - chalicosis. It occurs in the form of pseudohexagonal crystals formed during twinning. It has a prismatic or tabular form. Crystals often with shading. Color gray glandular, with a dark sheen. In the air easily it gets dark. At temperatures above 91 o C enters the hexagonal modification.
Chemical composition. Copper (Cu) 79.8%, sulfur (S) 20,2%; impurities: silver, cobalt, nickel, arsenic, gold. Form crystals. Rare tolstotablitchatye and short-columnar crystals. The crystal structure. Very difficult. Class symmetry. Rombo-pyramidal - mm2. The ratio of the axes. 0.436: 1: 0.492. Cleavage. A very imperfect at (110). Aggregates. Solid, fine-grained.
Most other minerals is copper in the form of a dense mass. Extremely similar to chalcocite digenite, dzharleitom and anilitom.
Diagnostic features.
burner flame colors in the green, while sulfur dioxide is released. It melts, turning the flame in blue color; on coal with soda gives wren copper.
Origin.
It occurs with native copper; their joint location - typically in the zone of secondary sulphide enrichment. Presented in hydrothermal veins and sedimentary deposits in the sandstones and tuffs.
Deposits and application.
Gorgeous crystals known in Cornwall, in the Urals, in Germany, from Yoahimstal in Bohemia, from Tsu-MEBA in Namibia, as well as the world's major copper deposit (Mexico, Peru, Chile, Spain, USA). In Italy, found mainly in Montekanini Val de Cecina (Tuscany region) and Kalbona (Sardinia).
- Gatchell - "New Almadén snag" - arsenide and antimony sulfide (modern sulphosalts)
- Antimony - toxic metal (semi-metal) are widely used in industry, medicine and engineering
- Zirconium - a rare and non- metal and dangerous jewel in the oxide and salts
- Gold - yellow dangerous and toxic metal -date and accurate digital cable technology
- Sulphur - a golden-yellow toxic substance and a sign of volcanic activity
- Cadmium - a toxic uncirculated unknown wide range of people silvery metal
- Lead - a poisonous gray simulator silver metal and toxic metal snag
- Arsenic - poison classic medieval and modern poisoners and medicine in medicine
Toxic and hazardous radioactive rocks and minerals
** - Poisonous stones and minerals (obligatory check in chemical laboratory + clear indication of toxicity)
** - Radioactive rocks and minerals (obligatory check on a regular dosimeter + ban on the open sale of radioactivity in the event of more than 24 mR / hour + additional measures to protect the population)
Catalog minerals and gems in groups of the world
** - Poisonous stones and minerals
** - Radioactive rocks and minerals
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