White Pine Mine, White Pine, Ontonagon Co., Michigan

29.6 x 17 x 3.8 cm
11.7 x 6.7 x 1.5 in

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The Copper in this specimen formed between layers of Nonesuch Shale which caused it to have a flattened habit. There is still a bit of the shale attached as well as white colored Barite. The Copper ranges from hackly to well formed crystals. On much of the specimen, the surface has a red coloration due to a thin layer of Cuprite caused by oxidation. Rather unusual for the species, the Barite fluoresces a dull orange (but not strong enough to get a decent photo).

Condition: Very Good

Flaws: The Barite is present as massive material with cleavage plane surfaces.

This mineral is also found in the following galleries: Minerals From Michigan | Copper | Sulfates | Minerals Priced Between 300 and 499 Dollars