Native Copper Slab - 24 pc lot

Native Copper Slab Native Michigan copper slabs feature copper-rich ore with quartz, basalt, epidote, and calcite coated with a thin coat of epoxy to prevent oxidation. The chemical symbol for copper is Cu. Michigan's Keweenaw Peninsula is considered the most important locality in the world for pure native copper Mining began in 1845 and continued through 1982, and over 7 million tons of refined copper were recovered from the mines. At the turn of the 20th century it led the world in copper production and "Lake Copper" was the purity standard. 2" - 4" This listing is for one box of 24 pieces. The pictures shown are representative of the pieces you will receive, but every slab is different from one another.