Heavy piece of purple-red massive Cuprite with green Malachite.
Originally explored in 1864 for Gold the Butte district later became one of the largest producing Copper districts in the World! For a great read on the history of Butte check out the DMM article, The Butte Mining District, Butte, Montana - A Summary of the History, Geology and Minerals.
Data courtesy of Webmineral.
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