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Topaz Mineral Data |
General Topaz Information |
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Al2SiO4(F,OH)2 | ||
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Molecular Weight = 182.25 gm | ||
Aluminum 29.61 % Al 55.95 % Al2O3 | |||
Silicon 15.41 % Si 32.97 % SiO2 | |||
Hydrogen 0.50 % H 4.45 % H2O | |||
Oxygen 43.02 % O | |||
Fluorine 11.47 % F 11.47 % F | |||
- % F -4.83 % -O=F2 | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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Al2(SiO4)F1.1(OH)0.9 | ||
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Pegmatites and high temperature quartz veins. Cavities in granites and rhyolites. Deposited by fluorine-rich vapors in rocks of rhyolite composition. | ||
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Valid Species (Pre-IMA) Prehistoric | ||
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Topasos Island in the Red Sea. Link to MinDat.org Location Data. | ||
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Named after its locality. | ||
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Pycnite - yellowish white- | ||
Topaz Image | |||
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Topaz Crystallography |
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a:b:c =0.4943:1:0.9545 | ||
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a = 4.35, b = 8.8, c = 8.4, Z = 4; V = 321.55 Den(Calc)= 3.76 | ||
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Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm | ||
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By Intensity(I/Io): 2.937(1), 3.195(0.65), 3.369(0.6), | ||
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Physical Properties of Topaz |
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{001} Perfect | ||
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Colorless, Pale blue, Yellow, Yellowish brown, Red. | ||
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3.5 - 3.6, Average = 3.55 | ||
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Transparent | ||
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Brittle - Uneven - Very brittle fracture producing uneven fragments. | ||
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Crystalline - Coarse - Occurs as well-formed coarse sized crystals. | ||
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Massive - Granular - Common texture observed in granite and other igneous rock. | ||
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Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
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8 - Topaz | ||
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Fluorescent, Short UV=golden yellow, Long UV=cream. | ||
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Vitreous (Glassy) | ||
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white | ||
Optical Properties of Topaz |
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CI meas= 0.146 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.193 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1653,KPDmeas= 0.1751,KC= 0.2049 Ncalc = 1.72 - 1.77 |
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Biaxial (+), a=1.606-1.629, b=1.609-1.631, g=1.616-1.638, bire=0.0090-0.0100, 2V(Calc)=58-68, 2V(Meas)=48-68. Dispersion noticeable, r > v. | ||
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colorless. | ||
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colorless. | ||
Calculated Properties of Topaz |
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Bulk Density (Electron Density)=3.51 gm/cc note: Specific Gravity of Topaz =3.55 gm/cc. |
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Fermion Index = 0.0074038512 Boson Index = 0.9925961488 |
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PETopaz = 1.53 barns/electron U=PETopaz x rElectron Density= 5.36 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Topaz is Not Radioactive |
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Topaz Classification |
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52.03.01.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O | ||
(52.03)with cations in [6] coordination only | |||
(52.03.01)Topaz Group | |||
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09.AF.35 09 - SILICATES (Germanates) | ||
09.A - Nesosilicates | |||
09.AF -Nesosilicates with additional anions; | |||
Other Topaz Information |
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Links to other databases for Topaz : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - CalTech Mineral Spectroscopy 5 - GeoScienceWorld 6 - Glendale Community College 7 - Google Images 8 - Google Scholar 9 - Handbook of Mineralogy (MinSocAm) 10 - Handbook of Mineralogy (UofA) 11 - HyperPhysics 12 - MinDAT 13 - Mineral and Gemstone Kingdom 14 - Mineralienatlas (Deutsch) 15 - Online Mineral Museum 16 - Philatelic Mineralogy 17 - QUT Mineral Atlas 18 - Ruff.Info 19 - Tradeshop.com - The Rainbow of Gems 20 - University of Colorado - Mineral Structure Data 21 - University of Texas at Austin 22 - theimage Search for Topaz using: Visit our Advertisers for Topaz : Ask about Topaz here : Print or Cut-and-Paste your Topaz Specimen Label here :
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