from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A yellow mineral, essentially CuFeS2, that is an important ore of copper. Also called copper pyrites.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A yellow mineral that is a mixed sulfide of copper and iron, with the chemical formula CuFeS2.
from the GNU version of the Collaborative International Dictionary of English
- n. Copper pyrites, or yellow copper ore; a common ore of copper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color.
from The Century Dictionary and Cyclopedia
- n. Copper pyrites, or yellow copper ore.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a yellow copper ore (CuFeS2) made up of copper and iron sulfide
The ore body grades below into a zone characterized by lean chalcopyrite, which is supposed to represent original or primary deposition from hot waters associated with the porphyry intrusion.
The copper in these deposits occurs as primary chalcopyrite (CuFeS2) or the important secondary copper mineral chalcocite (Cu2S).
~ Much of the copper of commerce is made from chalcopyrite and bornite, and these ores are more difficult to work.
Lead and zinc: zinc blende, chalcopyrite, galena, lead, zinc and copper concentrates
A set of specimens was exhibited by the Ellenville Zinc Company, consisting of strikingly beautiful crystalline masses of quartz galina, sphalerite and chalcopyrite and specimens of the rare mineral, brookite.
The common are is chalcopyrite, a copper sulphide; that is, it is composed of copper and sulphur.
In places the chalcopyrite has been changed to the delicate green carbonate of copper called malachite.
There is a rough zonal arrangement of the ore minerals around the intrusive, gold and copper minerals (chiefly enargite and chalcopyrite) being more prominent near the intrusive, and argentiferous galena and zinc blende richer at greater distances.
Below this is a zone carrying copper in the form of chalcopyrite, enriched by chalcocite deposition from above, ranging in thickness up to 400 feet.
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.
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