Mineralogy Database

Benitoite Mineral Data

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General Benitoite Information

Help on Chemical  Formula: Chemical Formula: BaTiSi3O9
Help on Composition: Composition: 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
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BaTiSi3O9
Help on Environment: Environment: Compact granular natrolite veins cutting a grayish green fibrous shist interlayered with serpentine.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1907
Help on Locality: Locality: 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.
Help on Name Origin: Name Origin: Named from its locality.
Help on Name Pronunciation: Name Pronunciation: Benitoite + Pronunciation Say BENITOITE
Help on Synonym: Synonym: ICSD 18100
  PDF 38-464

Benitoite Image

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Comments: Benitoite crystals in a natrolite and crossite matrix.
Location: Benitoite Gem Mine, San Benito Co., California, USA. Scale: Crystal size 1.5 cm.
© John Veevaert

Benitoite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.47121
Help on Cell Dimensions: Cell Dimensions: a = 6.6, c = 9.71, Z = 2; V = 366.30 Den(Calc)= 3.75
Help on Crystal System: Crystal System: Hexagonal - Ditrigonal Dipyramidal H-M Symbol (6 m2) Space Group: P 6c2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.72(1), 2.742(0.75), 3.32(0.4),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 0 1) ( 1 2 1) ( 1 1 1) ( 1 1 0)

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Physical Properties of Benitoite

Help on Cleavage: Cleavage: {1011} Poor
Help on Color: Color: Blue, Purple, Pink, White, Colorless.
Help on Density: Density: 3.6
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luminescence: Luminescence: Fluorescent, Short UV=blue.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Benitoite

Help on Gladstone-Dale: Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.757, e=1.804, bire=0.0470.

Calculated Properties of Benitoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Benitoite =3.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PEBenitoite = 146.17 barns/electron
U=PEBenitoite x rElectron Density= 488.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Benitoite is Not Radioactive

Benitoite Classification

Help on  Dana Class: Dana Class: (59)Cyclosilicate Three-Membered Rings
  (59.01)anhydrous, no other anions
  (59.01.01)Benitoite group Bazirite BaZrSi3O9 P 6m2 6 m2 Benitoite BaTiSi3O9 P 6c2 6 m2 Pabstite Ba(Sn,Ti)Si3O9 P 6c2 6 m2 Wadeite K2ZrSi3O9 P 63/m 6/m
Help on  Strunz Class: Strunz Class: 09.CA.05 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CA -[Si3O9]6- 3-membered single rings (dreier-Einfachringe),
09.CA.05 Bazirite BaZrSi3O9 P 6m2 6 m2
09.CA.05 Benitoite BaTiSi3O9 P 6c2 6 m2
09.CA.05 Pabstite Ba(Sn,Ti)Si3O9 P 6c2 6 m2

Other Benitoite Information

Help on References: References: NAME( Pough60) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: 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
20 - theimage

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Dana No: Strunz No: 09.CA.05





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