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Topaz - Wikipedia

Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2. Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces. It is one of the hardest naturally occurring minerals (Mohs hardness of 8) and is the hardest of any silicate mineral..

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What is Topaz Gemstone | Topaz Stone – GIA

Topaz actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Colorless topaz is plentiful, and is often treated to give it a blue color. Topaz is also pleochroic, meaning that the gem can show different colors in different crystal directions..

Topaz: The gemstone Topaz information and pictures

Topaz is a fairly common and inexpensive gemstone. It can be found in huge and flawless crystals, which can be faceted into giant gemstones which can weigh thousands of carat s. Some of the largest gemstone pieces ever cut were of Topaz. Topaz is a hard and durable gemstone, and will not dissolve in most chemical solvent s..

Topaz | Uses and Properties of the Mineral and Gem

Topaz occurs in a wide range of natural colors; however, most natural topaz is colorless. The most highly regarded colors are the reds and pinks, which receive their color from trace amounts of chromium. Chromium is also responsible for the color in violet and purple topaz..