Copper crystal from St. Claire Mine, Keweenaw Co., Michigan. Single 26x32x12mm crystal with rich tenorite patina.
|Dimensions||2.6 × 3.2 × 1.2 cm|
Copper “Skull” from Centennial Mine, Houghton Co., Michigan. Seldom seen formation which occurs when copper is deposited around cobbles in a conglomerate lode. The cobble deteriorates over time and leaves the copper “skull” formation. Specimen size is 95x85x40mm. From Ed Coleman Collection.