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Schorl Mineral Data +
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General Schorl Information |
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NaFe++3Al6(BO3)3Si6O18(OH)4 | ||
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Molecular Weight = 1,053.38 gm | ||
| Sodium 2.18 % Na 2.94 % Na2O | |||
| Aluminum 15.37 % Al 29.04 % Al2O3 | |||
| Iron 15.91 % Fe 20.47 % FeO | |||
| Silicon 16.00 % Si 34.22 % SiO2 | |||
| Boron 3.08 % B 9.91 % B2O3 | |||
| Hydrogen 0.38 % H 3.42 % H2O | |||
| Oxygen 47.08 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
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NaFe2+3Al6(BO3)3Si6O18(OH)4 | ||
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Granites, diorites, gabbro pegmatites, greisens, skarns and quartz veins. | ||
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Valid Species (Pre-IMA) 1524 (Dana # Changed) | ||
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Sonnenberg, Bodenmais and Spessart, Germany. Link to MinDat.org Location Data. | ||
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Old name of unknown origin. | ||
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ICSD 74180 | ||
| PDF 43-1464 | |||
| Schorl - (61.3.1.10) | |||
| Tourmaline | |||
Schorl Image | |||
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Schorl Crystallography |
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a:c = 1:0.44996 | ||
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a = 15.99, c = 7.195, Z = 3; V = 1,593.16 Den(Calc)= 3.29 | ||
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Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m | ||
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By Intensity(I/Io): 2.576(1), 2.961(0.85), 3.99(0.85), | ||
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Physical Properties of Schorl |
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[1011] Indistinct | ||
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Black, Brownish black, Greenish black, Bluish black. | ||
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3.1 - 3.2, Average = 3.15 | ||
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Opaque | ||
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Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | ||
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Acicular - Occurs as needle-like crystals. | ||
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Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
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Striated - Parallel lines on crystal surface or cleavage face. | ||
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7.5 - Garnet | ||
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Piezoelectric. | ||
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Vitreous (Glassy) | ||
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brown | ||
Optical Properties of Schorl |
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light brown, buff, or light gray. | ||
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dark brown, black, or deep gray. | ||
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CI meas= 0.144 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.18 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1979,KPDmeas= 0.2067,KC= 0.2415 |
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Uniaxial (-), e=1.633-1.64, w=1.66-1.672, bire=0.0270-0.0320. | ||
Calculated Properties of Schorl |
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relectron=3.10 gm/cc |
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Fermion Index = 0.01719 Boson Index = 0.98281 |
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PESchorl = 5.85 barns/electron |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Schorl is Not Radioactive |
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Schorl Classification |
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61.3e.1.10 (61)Cyclosilicate Six-Membered Rings | ||
| (61.3e)with borate groups (Sodic Tourmaline Subgroup) | |||
| (61.3e.1)Dana Group | |||
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VIII/E.19-50 VIII - Silicates | ||
| VIII/E - Cyklosilicates, six rings [Si6O18]12- | |||
| VIII/E.19 - Tourmaline group | |||
Other Schorl Information |
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NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | ||
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Links to other databases for Schorl : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Athena 6 - CalTech Mineral Spectroscopy 7 - EUROmin Project 8 - Ecole des Mines de Paris 9 - Franklin Minerals(Dunn) 10 - Google Images 11 - Google Scholar 12 - Handbook of Mineralogy (MinSocAm) 13 - Handbook of Mineralogy (UofA) 14 - MinDAT 15 - MinMax(Deutsch) 16 - MinMax(English) 17 - Mineral and Gemstone Kingdom 18 - Mineralienatlas (Deutsch) 19 - QUT Mineral Atlas 20 - Ruff.Info 21 - Scandinavian mineral gallery 22 - WWW-MINCRYST 23 - YupRocks Search for Schorl using: Visit our Advertisers for Schorl : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals The GeoZone Wrights Rock Shop Translate Schorl Mineral Data : Ask about Schorl here : Print or Cut-and-Paste your Schorl Specimen Label here :
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