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Topaz Mountain, in the Thomas mountain range, is the most traveled site in Millard Counties west desert. This white Rhyolite mountain contains various mineral deposits like Sherry Topaz, cubed Bixbyite, flakes of Hematite, Pseudo-Brookite needles, Garnets and Red Beryl. |
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Topaz, Utah's state gem, is a semiprecious gemstone that occurs as very hard, transparent crystals in a variety of colors. The topaz crystals at Topaz Mountain are naturally amber colored, but become colorless after exposure to sunlight. The crystals formed within cavities of the Topaz Mountain Rhyolite, a volcanic rock which erupted approximately six to seven million years ago (Tertiary Period) from volcanic vents along faults in the area. |
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A field guide to Topaz Mountain |