United States Geological Survey. Topaz is a mineral (Al2SiO4(F,OH)2) that forms orthorhombic crystals. Pure topaz is ... (more...)

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Topaz Mountain (Utah Geological Survey) Additional Links: The Mineral Topaz (Amethyst Galleries' Mineral Gallery) Topaz (Mindat.org) Topaz (Mineralogy Database) (more...)

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November Birthstone - Topaz." Nebraska State Geological Survey. http://csd.unl.edu/csd/birthstones/topaz/topaz.html. August 4, 2000. (more...)

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Feature ID: 183496: Name: Topaz Mountain: Class: Summit: Citation: Collected during Phase I data compilation (1976-1981), primarily from U.S. Geological Survey 1:24,000-scale ... (more...)

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... approximately six to seven million years ago (Tertiary Period) from volcanic vents along faults in the area. A field guide to Topaz Mountain. Topaz Mountain Tips!" Utah Geological ... (more...)

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... chemical scaled changes in the geological constitution of tomato and the decreasing of the avarage daily quantity of the global topaz harvest vagy Changes between the geological ... (more...)

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The Utah Geological Survey investigates and reports on Utah's geologic hazards, mineral, energy, water, and paleontological resources, maps the state's geology, and provides ... (more...)

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Topaz is the standard for Mohs hardness 8. ... Geologic Features and Processes Glaciers and Ice Landforms Minerals Rocks Geology and Society (more...)

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Geologic conditions of formation: Topaz crystallizes from fluorine-bearing vapor in last stages of solidification of igneous rocks. Thus, cavities in lavas and granitic rocks: (more...)

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Chinese Topaz Specimens Fine topaz crystals from China are known but not very common. They are easily as nice as the best from the gem pegmatites of Pakistan and often ... (more...)

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