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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.
Where Does It Come From. This blue variety of Topaz is a stone that is often used in jewelry, as the Blue Topaz gemstones are so lovely to look at. Topaz comes from a range of different places, including India, Pakistan, Sri Lanka, South Africa, Japan, Australia, Mexico and the USA.