Digenite

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This is a huge single crystal of digenite, one of the more rare copper sulfides in crystalline form. Butte was known for these, 50 years ago, but crystals of this caliber and size are now hard to come by. It has a wonderful form, and a classic dull matte luster (distinct from chalcocite from this locality). Overal, it displays fairly dramatically, surprising for a "black ugly"