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Benitoite Mineral Data |
General Benitoite Information |
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BaTiSi3O9 | ||
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Molecular Weight = 413.46 gm | ||
Barium 33.21 % Ba 37.08 % BaO | |||
Titanium 11.58 % Ti 19.32 % TiO2 | |||
Silicon 20.38 % Si 43.60 % SiO2 | |||
Oxygen 34.83 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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BaTiSi3O9 | ||
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Compact granular natrolite veins cutting a grayish green fibrous shist interlayered with serpentine. | ||
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Valid Species (Pre-IMA) 1907 | ||
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Benitoite Gem mine, head waters of the San Benito river, 1 mile south of Santa Rita Peak, San Benito County, California, USA Link to MinDat.org Location Data. | ||
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Named from its locality. | ||
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Benitoite + Pronunciation ![]() |
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ICSD 18100 | ||
PDF 38-464 | |||
Benitoite Image | |||
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Benitoite Crystallography |
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a:c = 1:1.47121 | ||
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a = 6.6, c = 9.71, Z = 2; V = 366.30 Den(Calc)= 3.75 | ||
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Hexagonal - Ditrigonal Dipyramidal H-M Symbol (6 m2) Space Group: P 6c2 | ||
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By Intensity(I/Io): 3.72(1), 2.742(0.75), 3.32(0.4), | ||
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Mouse |
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Physical Properties of Benitoite |
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{1011} Poor | ||
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Blue, Purple, Pink, White, Colorless. | ||
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3.6 | ||
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Transparent to translucent | ||
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Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
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Tabular - Form dimensions are thin in one direction. | ||
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6-6.5 - Orthoclase-Pyrite | ||
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Fluorescent, Short UV=blue. | ||
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Vitreous (Glassy) | ||
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Nonmagnetic | ||
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white | ||
Optical Properties of Benitoite |
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CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2081,KPDmeas= 0.2168,KC= 0.2141 Ncalc = 1.77 - 1.8 |
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Uniaxial (+), w=1.757, e=1.804, bire=0.0470. | ||
Calculated Properties of Benitoite |
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Bulk Density (Electron Density)=3.34 gm/cc note: Specific Gravity of Benitoite =3.60 gm/cc. |
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Fermion Index = 0.08 Boson Index = 0.92 |
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PEBenitoite = 146.17 barns/electron U=PEBenitoite x rElectron Density= 488.71 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Benitoite is Not Radioactive |
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Benitoite Classification |
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59.01.01.02 (59)Cyclosilicate Three-Membered Rings | ||
(59.01)anhydrous, no other anions | |||
(59.01.01)Benitoite group | |||
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09.CA.05 09 - SILICATES (Germanates) | ||
09.C - Cyclosilicates | |||
09.CA -[Si3O9]6- 3-membered single rings (dreier-Einfachringe), | |||
Other Benitoite Information |
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NAME( Pough60) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
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Links to other databases for Benitoite : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - CalTech Mineral Spectroscopy 5 - EUROmin Project 6 - Ecole des Mines de Paris 7 - GeoScienceWorld 8 - Google Images 9 - Google Scholar 10 - Handbook of Mineralogy (MinSocAm) 11 - Handbook of Mineralogy (UofA) 12 - HyperPhysics 13 - MinDAT 14 - Mineralienatlas (Deutsch) 15 - Online Mineral Museum 16 - QUT Mineral Atlas 17 - Ruff.Info 18 - Tradeshop.com - The Rainbow of Gems 19 - WWW-MINCRYST 20 - theimage Search for Benitoite using: Visit our Advertisers for Benitoite : Ask about Benitoite here : Print or Cut-and-Paste your Benitoite Specimen Label here :
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