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Tridymite is a rare polymorph of the mineral Quartz. However, its crystals are very distinct and form very different habits from Quartz. Many Tridymite specimens are in fact pseudomorphs of Quartz after Tridymite, as the Tridymite often alters to the more common Quartz in many environments. After Quartz replaces the Tridymite, it still retains the original, distinct crystal form of Tridymite. True Tridymite and Quartz pseuomorphs are virtually indistinguishable without locality knowledge or x-ray analysis. The name "Tridymite" was derived from its most common crystal habit as pseudohexagonal trillings.
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Tridymite is a valuable mineral to collectors. Specimens of this rare and distinctive mineral provide interest to hobbyists. Tridymite is also used in scientific study. Its crystals provide key information to how crystals form, and how they change over in different environments. Tridymite is also synthetically produced for the production of refractory ceramics.
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Some of the finest examples are from the Euganean Hills (Zovon and San Pietro in Montagna), Italy. Upon analysis, crystals from these localities were determined to be Quartz pseudomorphs after Tridymite. Other localities include Lyttleton Harbor, New Zealand; Dinas Head, Padstow, Cornwall, England; Vechec, Northern Slanske Mountains, Slovakia; and Cerro San Cristobal, Pachua, Mexico.
In the U.S., Tridymite occurs in the Thomas Range, Juab Co., Utah; Beidel Creek, in the San Juan Mountains in Colorado; Obsidian Cliff in Yellowstone National Park, Wyoming; Highway 78 roadcut, Big Lue Mountains, Greenlee Co., Arizona; and Mt. Lassen in Lassen Volcanic National Park, California.
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The unusual crystals and mode of occurrence distinguish Tridymite from all other minerals.
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Have a question about Tridymite? Visit our Q&A Community and ask the experts!
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