From Quincy Mine, Hancock, Keweenaw Peninsula Copper District, Houghton County, MichiganLustrous translucent parallel scalenohedral calcite crystals with metallic copper inclusions on matrix. The copper inclusions are visible throughout the crystals.*Custom Lucite base shown included with purchase1.25 lbs, 4'' x 3.5'' x 2.5''

Lustrous specimen of native (natural) copper intergrown with greenish basalt matrix. The copper is exposed on all sides and has bright metallic surfaces. Michigan's Keweenaw Peninsula is the most important locality in the world for pure native copper. Mining began in 1845 and continued until 1982 and over 7 million tones...