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Chalcocite



Chalcocite

General
CategoryMineral
Chemical formulacopper(I) sulfide:Cu2S
Identification
Colordark-gray to black
Crystal habittabular to prismatic crystals also massive to granular
Crystal systemorthorhombic 2/m 2/m 2/m at < 105°C - hexagonal 6/m 2/m 2/m above 105°C
Cleavageimperfect in two directions
Fractureconchoidal
Mohs Scale hardness2.5 - 3
Lustermetallic
Refractive indexopaque
Streakshiny black to lead gray
Specific gravity5.5 - 5.8
Fusibility2-2.5
Other Characteristicssectile

Chalcocite, copper(I) sulfide (Cu2S), is an important copper ore mineral. It is opaque, being colored dark-gray to black with a metallic luster. It has a hardness of 2½ - 3. It is a sulfide with an orthorhombic crystal system.

Additional recommended knowledge

Chalcocite is sometimes found as a primary vein mineral in hydrothermal veins. However, most chalcocite occurs in the supergene enriched environment below the oxidation zone of copper deposits as a result of the leaching of copper from the oxidized minerals. It is also often found in sedimentary rocks.

It has been mined for centuries and is one of the most profitable copper ores. The reasons for this is its high copper content (67% atomic ratio and nearly 80% by weight) and the ease at which copper can be separated from sulfur. Still, it is not considered a primary source of copper ore due to its scarcity.

Fine crystals of chalcocite are quite uncommon and are much sought after. The now depleted mines at Cornwall, Great Britain and Bristol, Connecticut have produced the most famous clusters of wonderfully formed chalcocite crystals.

Since chalcocite is a secondary mineral that forms from the alteration of other minerals, it has been known to form pseudomorphs of many different minerals. A pseudomorph is a mineral that has replaced another mineral atom by atom, but it leaves the original mineral's crystal shape intact. Chalcocite has been known to form pseudomorphs of the minerals bornite, covellite, chalcopyrite, pyrite, enargite, millerite, galena and sphalerite.

The term chalcocite comes from the alteration of the obsolete name chalcosine, from the Greek khalkos, meaning copper. It is also known as redruthite, vitreous copper and copper-glance.

References

  • Dana's Manual of Mineralogy ISBN 0-471-03288-3
  • mindat.org
  • Webmineral.com
  • Mineral Galleries

Gallery

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chalcocite". A list of authors is available in Wikipedia.
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