Chamosite, a chlorite mineral, pseudomorphing a sharp and well-formed Almandine garnet crystal. These "black diamonds" frustrated miners by damaging the crushers, now considered a mineral collector's prize.
Dimensions (millimeters): 24 x 20 x 15
Dimensions (inches): .95 x .75 x .6
Origins: Michigamme (Mt. Shasta) Mine, Marquette County, Michigan
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