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Lake Otero
Peru and the Alps were the only sources of pink fluorite at astronomical prices
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unescaped gases form voids in the otherwise solid flow
which has a silica content of 50 to 85%
chalcopyrite - larger student specimens from a skarn in Mexico's Sierra Madre - Unit of 5 student specimens Lake Oterochalcopyrite 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
