| 9dhuu ((2 THERMOLUMINESCENT DOLOMITE)), $10 MINIMUM BID, Ontario Mine, Park City, Summit County, Utah, 6 x 6 x 6 cm and 4 x 4 x 3 cm, 2 Miniatures, U of U Specimen | |
 | Thermoluminescence is when absorbed light is re-emitted on heating. Here are two specimens from the Ontario Mine in historic Park City, Utah. ex University of Utah Dept of Geol and Geophys. ex J A Whelan. |
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