Cryptomelane (Ref: 1392180)
Montreal mine, Iron Co., Wisconsin, USA
180mm x 110mm x 40mm
An outstanding example for the species with lustrous botryoidal black cryptomelane in a cluster with very little attached matrix. Good examples such as this for the species from this old locality are rarely if ever seen available on the market today. Identification was confirmed at the A. E. Seaman Museum. The specimen was displayed for the public at the East Coast 2018 show.From: Weinrich Minerals
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