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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.
In case of Blue Topaz, it is very hard to determine where one color ends and another starts. A simple rule of thumb is applied all over the world i.e. light blue is Sky, medium blue is Swiss and dark blue is London. Topaz is colorless or white quartz, the color blue is result of various radiation and heat treatments.