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Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2. It is used as a gemstone in jewelry and other adornments. Topaz in its natural state is a golden brown to yellow. A variety of impurities and treatments may make topaz wine red, pale gray, reddish-orange, pale green, pink, or opaque.
Physically Topaz is a nesosilicate mineral. It is one of the hardest naturally occurring minerals with a relatively low index of refraction. It is produced in many places in the world. The name topaz is derived from the Greek words Τοpáziοs or Τοpáziοn.