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" The contrast between upperside and underside is well illustrated here
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Lake Otero
the same sand that forms the dunes at White Sands National Park
chalcopyrite - larger student specimens from a skarn in Mexico's Sierra Madre - Unit of 5 student specimens " The contrast between uppersidechalcopyrite 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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