11" Copper Ore Slab from Lake Superior Copper District DS1220 sloth Rainbow Obsidian is another form

Rainbow Obsidian is another form of Sheen Obsidian that gets its iridescent sheen from inclusions of magnetite nano-particles

all true trapiche gems contain inclusions of organic matter

Moonstone is frequently used in jewelry

Mystic Quartz Cuff

including Sri Lanka

11" Copper Ore Slab from Lake Superior Copper District DS1220 sloth Rainbow Obsidian is another form11" Copper Ore Slab from Lake Superior Copper District Approx. Dimensions: 11x8. 5x0. 5 inches Approx. Weight: 1125 grams Locality: Upper Peninsula, Michigan This large copper ore slab has a high gloss varnish on the front. It includes an acrylic slab stand. Copper mining in Michigan's Upper Peninsula has a rich history dating back over a century. The Keweenaw Peninsula, particularly the Quincy, Calumet, and Copper Harbor regions, was once home to one