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a. Metallic copper, sometimes containing a little silver and bismuth, that
occurs as a metasomatic deposit filling cracks and forming the cement of
sandstone and conglomerate. Such deposits have been found in the Keweenaw
Peninsula, Lake Superior, MI, USA; Chile; Queensland, Australia; and
Zimbabwe. Native copper is also found in the upper workings of copper
mines.
b. A mineral in the form of particles and nuggets of very pure metallic
copper associated (but not alloyed) with small amounts of silver and
arsenic minerals. It is found in small amounts in many copper ores but
occurs in commerical quantities in only one place in the world, the Upper
Peninsula in Michigan. See also: copper
Source:
Dictionary of Mining, Mineral, and Related Terms
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