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Bobtraillite Mineral Data

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General Bobtraillite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O
Help on Composition: Composition: Molecular Weight = 6,318.09 gm
   Barium      0.35 %  Ba    0.39 % BaO
   Sodium      4.08 %  Na    5.49 % Na2O
   Strontium  14.69 %  Sr   17.37 % SrO
   Calcium     0.77 %  Ca    1.08 % CaO
   Yttrium     0.89 %  Y     1.13 % Y2O3
   Hafnium     0.40 %  Hf    0.47 % HfO2
   Zirconium  18.32 %  Zr   24.75 % ZrO2
   Niobium     0.90 %  Nb    1.28 % Nb2O5
   Silicon    18.51 %  Si   39.60 % SiO2
   Boron       1.03 %  B     3.31 % B2O3
   Hydrogen    0.57 %  H     5.13 % H2O
   Oxygen     39.50 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na11.2Ca1.22Sr10.59Ba0.16Zr12.69Y0.63Nb0.61Hf0.14Si41.64B6O132(OH)12�12(H2O)
Help on Environment: Environment: Found in igneous breccias and nepheline syenite pegmatites.
Help on IMA Status: IMA Status: Approved IMA 2001 (Dana # Added)
Help on Locality: Locality: Poudrette quarry, Mont Saint-Hilaire Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Robert (Bob) James Traill (1921-), mineralogist, former head of the mineralogy section of the Geological Survey of Canada (1953-1986), and for his contributions to mineral ogy.
Help on Synonym: Synonym: IMA2001-041

Bobtraillite Image

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Comments: Transparent, hexagonal bobtraillite prisms, co-type material.
Location: Mont Saint-Hilaire, Rouville County, Quebec, Canada. Scale: See Image.
© Rruff Database

Bobtraillite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.50602
Help on Cell Dimensions: Cell Dimensions: a = 19.72, c = 9.9788, Z = 1; V = 3,360.65 Den(Calc)= 3.12
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3c1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.745(1)(332), 3.95(0.6)(212), 3.12(0.55)(331),3.75(0.46)(302), 17.08(0.44)(100), 1.987(0.43)(334), 6.46(0.39)(210), 5.42(0.34)(211), 1.898(0.32)(900),

Physical Properties of Bobtraillite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray, Pale green, Brown.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Bobtraillite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2038,KC= 0.2034
Ncalc = 1.63
Help on Optical Data: Optical Data: Uniaxial (+), w=1.627, e=1.645, bire=0.0180.

Calculated Properties of Bobtraillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Bobtraillite =3.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEBobtraillite = 49.66 barns/electron
U=PEBobtraillite x rElectron Density= 148.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bobtraillite is Not Radioactive

Bobtraillite Classification

Help on  Dana Class: Dana Class: (59)Cyclosilicate Three-Membered Rings
  (59.02.02)Catapleiite group Catapleiite (Na,Ca,[])2ZrSi3O9•2(H2O) B2/b (pseudo-HEX) 2/m Calciocatapleiite (Ca,[])ZrSi3O9•2(H2O) Pbnn 2/m 2/m 2/m Gaidonnayite Na2ZrSi3O9•2(H2O) P 21nb mm2 Georgechaoite KNaZrSi3O9•2(H2O) P 21nb mm2 Loudounite NaCa5Zr4Si16O40(OH)11•8(H2O) Mono Bobtraillite! (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O P 3c1 3 2/m
Help on  Strunz Class: Strunz Class: 09.CA.30 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CA -[Si3O9]6- 3-membered single rings (dreier-Einfachringe),
09.CA.30 Bobtraillite! (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O P 3c1 3 2/m

Other Bobtraillite Information

Help on References: References: NAME( AmMin, v90, p1945) PHYS. PROP.(AmMin, v90, p1945) OPTIC PROP.(AmMin, v90, p1945)
Help on See Also: See Also: Links to other databases for Bobtraillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.CA.30





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