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- Mineralogy and geology*
- Common Associations
Mineralogy and Geology of Chalcocite
Mineral formula: Cu2S
Mineral group: member of the Chalcocite-Digenite group
Crystal system: monoclinic
Crystal habit: massive, or tabular prismatic.
Cleavage: poor / indistinct
Color: blue-black, gray, black, or black-gray
Streak: blackish lead gray
Luster: metallic, sub-metallic
Moh’s scale hardness: 2 ½ - 3
Specific gravity: 5.5 – 5.8
Named after: the Greek word, "chalkos", copper, in 1832 by François Sulpice Beudant. This mineral was known by a wide variety of names previously, including “chalcosine”. In 1868, James D. Dana and George J. Brush renamed this material "chalcocite".
Geological occurrence: A secondary mineral in or near the oxidized zone of copper sulfide deposits.
Chakra - base chakra
Birthstones - no traditional associations
Wedding - no traditional associations
* Mineralogical information is from mindat.org