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See comment at Note
both have strong phosphorescence
it produced around three million tons of ore between 1980 and 2000
When calcite is free of impurities and is optically clear
is usually earthy or granular
chalcopyrite - teaching student specimens from a skarn in Mexico's Sierra Madre - Unit of 10 smaller specimens See comment at Notechalcopyrite CuFeS2 El Bolvar Mine Piedras Verdes District, municipality of Uruque, Chihuahua, Mexico The Bolvar Mine is an historic underground copper zinc mine, working a skarn formed during contact metamorphism of carbonate bearing rocks. Located in an area of northwestern Mexico's Sierra Madre that has been mined and prospected for polymetallic copper zinc lead silver and gold deposits since the Spanish colonial period, it produced around three
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