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All Auction Archive Items > Minerals > Native Metals
EXTREMELY LARGE COPPER NUGGET - "FLOAT COPPER". ... (Total: 1 Items)
Lot: 41085,
Auction: 2009 January Signature Natural History Auction #6012
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| Sold for: | Sign-in or Join (free & quick) |
| Ended: | Jan 17, 2009 |
| Item Activity: |
1 Internet/mail bidders
 512 page views |
Description:
Keweenaw Peninsula, Michigan
Copper 'nuggets' from the Upper Peninsula of Michigan are not particularly rare. Large ones with multiple hollow 'casts', where Calcite crystals were once embedded in them, are. We know that the 'casts' were of Calcite crystals because in a few, recessed areas there are still remnants of those crystals. The rounded exterior is the result of glacial 'scouring' during the last Ice Age, when enormous moving masses of ice bulldozed through copper seams in the country rock of the area. Upon melting, the glacier literally 'dropped its load', scattering debris far and wide. Rarely are they found in this size and particularly rare, with these features. The exterior has been polished in selected areas to provide a window into the shining interior of this exceptional specimen that measures an impressive 30 ¾ x 19 ½ x 6 ½ inches thick. It weighs a whopping 313 pounds.
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