Topaz

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.