18950: Copper - $8 Calumet, Calumet Township, Houghton County, Michigan Miniature - 4.1 x 2.0 x 1.5 cm 12 grams Specimen status: Available Send an email with specimen number to order Native copper, somewhat bright (but
uncleaned) to black, atop and in rock matrix. No
crystalline structure is visible. A very affordable
example illustrative of Michigan
native copper, not torn from matrix by a glacier. No
damage.
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