Spinel-twinned Copper (old classic) ex Schlichter Coll.

Champion Mine, Houghton Co., Michigan
Thumbnail, 2.6 x 1.2 x 0.8 cm
Start Time: 09/23/2010 6:30:00 pm (CDT)
End Time: 09/30/2010 6:30:00 pm (CDT)
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Item Description

A classic and striking copper thumbnail specimen from the famous Champion Mine of Michigan"s famed Copper Country. Fabulous, dentritic groupings of spinel-twinned copper crystals spring outward from a single long "backbone" of spinel-twinned copper. The crystals have a beautiful variable patina. This form of copper crystals was classified as Type I branching by Dana in 1886. The historic Champion Mine operated from 1902 to 1967and this is probably an old-timer, as it is very high quality.

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