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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.
Topaz gets its name from the Greek word topazion, which may originate from the Sanskrit tapas, meaning, âfire.â The name might also come from the name of the Egyptian island of topazos (now St Johns island) in the Red Sea.