• Copper - FCU185

Copper - FCU185

Michigan Float Copper, Keweenaw Peninsula 

19" tall

Float copper is native copper that was separated from the volcanic rock (basalt) within which it formed (ca. 1.2 billion years ago) and carried by glaciers during the last ice age (ca. 10,000 years ago). The long period of burial since the cessation of glacial movements oxidized the surface copper. The resulting oxidation products are primarily malachite (a green copper carbonate) and cuprite (a red copper oxide).

This specimen, once polished, will be one of my centerpieces in Tucson 2020. Contact me directly to discuss polishing options: cory.cotter@icloud.com