Chalcocite
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Description: 

Chalcocite (copper sulphide) is an important ore mineral of copper.  It has more than double the copper content by weight % of chalcopyrite (the most common ore of copper) and is therefore a much more profitable ore mineral.  It was the main copper ore worked in the rich West Penwith mines of Geevor, Botallack and Levant. 

This specimen is from Geevor and was collected underground in 1964. It shows beautiful, almost hexagonal, tabular crystals intergrown with each other.

Geevor is better known as a tin mine, with underground workings that extended out under the sea. It was one of the last working mines in Cornwall, closing in 1990.

Chemical Formula: Cu2S

Specimen no. TRURI: 2005.42.1
Location: Geevor mine, Pendeen
Grid Reference: SW 375 345

Mindat http://www.mindat.org/min-962.html

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Location precision: 
Good
Timescale:
Not known
Ma = Millions of years ago
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mineral
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