American Heritage® Dictionary of the English Language, Fourth Edition
- n. A dark gray mineral, essentially Cu2S, that is an important ore of copper.
Century Dictionary and Cyclopedia
- n. A native copper sulphid (Cu2S), a mineral of a lead-gray to black color and metallic luster. It is commonly massive, but is also found in fine crystals, frequently hexagonal in form from twinning. It is an important ore of copper. Also called chalcosin, copper-glance, and in Cornwall redruthite, from the locality Redruth, where it occurs.
GNU Webster's 1913
- n. (Min.) Native copper sulphide, called also
copper glance, and vitreous copper; a mineral of a black color and metallic luster.
- n. a heavy grey mineral that is an ore of copper
- Alteration of obsolete chalcosine, from Greek khalkos, copper. (American Heritage® Dictionary of the English Language, Fourth Edition)
“chalcocite" of our present metallurgical science, which is a sulphide containing very nearly eighty per cent. of copper.”
“The copper in these deposits occurs as primary chalcopyrite (CuFeS2) or the important secondary copper mineral chalcocite (Cu2S).”
“In the easy recognition of the secondary copper sulphides, chalcocite, bornite, etc., the engineer finds a finger-post on the road to extension in depth; and the directions upon this post are not to be disregarded.”
“The essential fact appears to be that as enrichment progresses and chalcocite increases the process of enrichment becomes slower in action, and erosion may, in some circumstances, overtake it.”
“The primary copper mineral in the limestone is chalcocite, in exceptionally rich and solid masses, showing no evidence of having replaced earlier sulphides.”
“Copper is known to be taken into solution as copper sulphate at the surface, and to be redeposited as chalcocite where these sulphate solutions come in contact with chalcopyrite or pyrite below.”
“While some chalcocite is clearly the result of secondary enrichment from above, other chalcocite seems to have been related closely to the primary deposition.”
“In the United Verde Mine, oxidizing conditions at present prevail to the bottom of the chalcocite zone.”
“No traces of other primary minerals are present and the chalcocite here is regarded as probably primary.”
“It was formerly supposed that most of the chalcocite was of this origin; but as chalcocite is found in important amounts with enargite and chalcopyrite to great depths (now 3,500 feet), where the veins are still rich and strong, it begins to appear that much of the chalcocite is of primary origin.”
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List of minerals, elements, group names and geochemistry terms encountered in the science of mineralogy. I've chosen to avoid capital letters in most examples, though a great many mineral names hon...
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