Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces. Color and varieties; Gallery; Related pages; Images for kids; Color and varieties . Ratio: a:b:c = 0.528 : 1 : 0.955. The typical topaz is wine, yellow, pale gray, reddish-orange, or blue brown. Use correct case for element symbols. General Topaz Information : Chemical Formula: Al2SiO4(F,OH)2 : Composition: Molecular Weight = 182.25 gm Aluminum 29.61 % Al 55.95 % Al 2 O 3 Silicon 15.41 % Si 32.97 % SiO 2 Hydrogen 0.50 % H 4.45 % H 2 O Oxygen … Natural Topaz Gemstones A brief outline. It includes the minerals aluminium and fluorine with the chemical formula Al 2 Si O 4 (F,OH) 2. Some rare and exceptional topaz is pale pink, sherry red or blue. If correct case is not used, the formula may be ambiguous and the interpretation chosen may not be the desired one. TOPAZ … Topaz does not have a chemical formula, as it is a mineral and not an element. "Spanish Topaz" is a misnomer used for brownish red citrine from Spain which has been heat treated to a red-orange color.
Cell Parameters: a = 4.65 Å, b = 8.8 Å, c = 8.4 Å. Pure topaz is colorless and transparent but they usually have colors made by small impurities. Geographic location: Brazil: Ouro Preto and Minas Gerais; Siberia and the Ural Mnts. -- yellow, brown, orange, beige, red and green . The blue color (when naturally occurring) is due to an impurity. Pure Topaz is colorless, but it occurs in a variety of colors due to various impurities. Topaz Mineral Data Search Webmineral : Home: Crystal: jmol: jPOWD: Chem: X Ray: Dana: Strunz: Properties: A to Z: Images: Share : News: Help: About: Advertisment. CURIOSITIES: related to the enhancement of self-confidence . Topaz Gemstone Information.
IMA Formula: Al 2 SiO 4 F 2. Elements listed: Al, F, H, O, Si - search for minerals with similar chemistry. But most blue topaz is artificially created by irradiation of Pale Topaz from Brazil, Sri Lanka, Nigeria or China. . General Topaz Information : Chemical Formula: Al2SiO4(F,OH)2 : Composition: Molecular Weight = 182.25 gm Aluminum 29.61 % Al 55.95 % Al 2 O 3 Silicon 15.41 % Si 32.97 % SiO 2 Hydrogen 0.50 % H 4.45 % H 2 O Oxygen 43.02 % O Fluorine 11.47 % F 11.47 % F - % F -4.83 % -O=F 2 _____ _____ 100.00 % 100.00 % = TOTAL OXIDE: Empirical Formula: Al 2 (SiO 4)F 1.1 (OH) 0.9: Environment: … Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces. Showing all 1 result. Other Brazilian occurrences are Mimoso do Sul, in Espírito Santo, which has produced very large crystals; and Brumado, in Bahia, which produces fine natural pink crystals. It can also be made white, pale green, blue, gold, or pink (rare). Topaz crystallizes from fluorine-bearing vapor in last stages of solidification of igneous rocks. Topaz is a silicate meeneral o aluminium an fluorine wi the chemical formula Al 2 Si O 4 (F,OH) 2. Crystallography of TopazHide Crystal System: Orthorhombic. It is one of the hardest naturally occurring minerals (Mohs hardness of 8) and is the hardest of any silicate (i.e., silicon-based) mineral.
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