From Old French topace (compare French topaze), from the Ancient Greek proper noun Τοπάζιος (Topázios), ancient name of St. John's Island, Egypt, in the Red Sea, believed to be the first discovered source of the mineral τοπάζιον (topázion, “peridot”).
- A silicate mineral of aluminium and fluorine, usually tinted by impurities.
- An often clear, yellowish-brown gemstone cut from this.
- 2012 March 1, Lee A. Groat, “Gemstones”, in American Scientist, volume 100, number 2, page 128:
- Although there are dozens of different types of gems, among the best known and most important are diamond, ruby and sapphire, emerald and other gem forms of the mineral beryl, chrysoberyl, tanzanite, tsavorite, topaz and jade.
- A yellowish-brown color, like that of the gemstone.
- topaz colour:
- (historical, British India) A black Catholic soldier in the British Army.
- → Welsh: topas
- “Topaz” in David Barthelmy, Webmineral Mineralogy Database, 1997–.
- “topaz”, in Mindat.org, Hudson Institute of Mineralogy, accessed 29 August 2016.
topaz m inan
- topaz (gem)