topaz wikipedia - EAS
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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. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow orange. Topaz is often treated … See more
The name "topaz" is usually believed to be derived (via Old French: Topace and Latin: Topazus) from the Greek Τοπάζιος (Topázios) or Τοπάζιον (Topázion), from Τοπαζος. This is the ancient name of St. John's Island in … See more
Topaz is a gemstone. In cut and polished form, it is used to make jewellery or other adornments. It also has other uses. Orange topaz, also known as precious topaz, is the conventional birthstone for November, the symbol of friendship and the See more
Topaz is commonly associated with silicic igneous rocks of the granite and rhyolite type. It typically crystallizes in granitic pegmatites or in vapor cavities in rhyolite lava flows including those at Topaz Mountain in western Utah and Chivinar in South America. It … See more
Nicols, the author of one of the first systematic treatises on minerals and gemstones, dedicated two chapters to the topic in 1652. In the Middle Ages, the name topaz was … See more
• Topaz from the International Colored Gemstone Association
• Topaz and other minerals found at Topaz Mountain, Juab County, Utah Geological Survey See moreWikipedia text under CC-BY-SA license - People also ask
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