| PLATTNERITE on CALCITE, Hidden Treasure Mine, Ophir Hill District, Tooele county, Utah, 7 x 4.5 x 3.5 cm | |
 | Cream colored mounds of Calcite with black Plattnerite on one side of the specimen. Black Plattnerite on and included in the Calcite on that side causes the Calcite to also be black. This is another Utah mine that has been closed by the state by rebarring the front opening. |
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