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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.
Unique Birthstone Jewelry. Yellow Topaz is the modern November birthstone and blue topaz is the Modern December birthstone. Topaz is the accepted gem for the fourth, 19th and 23rd wedding anniversaries. See other December and November birth stones: Traditional, Contemporary, Mystical, Ancient, Zodiac and Star signs. See more topaz jewelry.