Barite, Calcite and Franklinite, Sterling Mine, Sterling Hill, New Jersey

This is a large-grained rock containing light grey-colored calcite and barite, and black franklinite crystals; a much sought after mineral assemblage from the Sterling Mine, Sterling Hill, Sussex County, New Jersey.  Under short wave UV the calcite fluoresces red/orange and the barite white.  The Franklinite is not fluorescent.  The size of this specimen is 38.0 x 23.7 x 16.3 mm.

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