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Topaz is an aluminum silicate containing fluorine and has a chemical formula of Al2(F,OH)2SiO4. It is formed by fluorine-bearing vapours given off during the last stages of the crystallization of igneous rocks. It typically occurs in cavities in rhyolites and granite, in pegmatite dikes, and in high-temperature veins.
The Texas State Gem. Topaz, the state gem of Texas, is found within the borders of the state only in Mason County. It occurs in granite outcroppings principally in the Streeter, Grit, and Katemcy areas. It is usually found in streambeds and ravines but occasionally can be located atop the ground.