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Opalized fluorite, or bertrandite, or ice cream stone, is best known under the trade name Tiffany Stone. Opalized fluorite is mainly composed of fluorite with opal, calcite, dolomite, quartz, chalcedony, bertrandite and other minerals in very small amounts. This stone is found only at the Brush Wellman mine on Spor Mountain in western Utah, and most of it is used to produce beryllium.
Set in an adjustable sterling silver ring.