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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 majority of topaz is colorless and is called topaz. The next most abundant color of topaz is blue and green. The most frequently seen stones in jewelry are the shades yellow or sherry brown, and pink. Clear, pink, blue and honey-yellow varieties of topaz are especially valued.