Bobtraillite Mineral Data

Bobtraillite Mineral Data

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General Bobtraillite Information

Chemical Formula:

Na15Sr12Zr14Si42B6O138(OH)6·12(H2O)

Composition:

Molecular Weight = 6,444.02 gm

Sodium 5.35 % Na 7.21 % Na₂O

Strontium 16.32 % Sr 19.30 % SrO

Zirconium 19.82 % Zr 26.77 % ZrO₂

Silicon 18.31 % Si 39.16 % SiO₂

Boron 1.01 % B 3.24 % B₂O₃

Hydrogen 0.47 % H 4.19 % H₂O

Oxygen 38.73 % O

______ ______

100.00 % 99.88 % = TOTAL OXIDE

Empirical Formula:

Na₁₅Sr₁₂Zr₁₄Si₄₂B₆O₁₃₈(OH)₆·12(H₂O)

IMA Status:

Proposed IMA 2001 (Dana # Added)

Locality:

Mont Saint-Hilaire. Link to MinDat.org Location Data.

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 hisc ontributions to mineral ogy.

Synonym:

IMA2001-041

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Bobtraillite Crystallography

Axial Ratios:

a:c = 1:0.40135

Cell Dimensions:

a = 19.72, c = 7.9148, Z = 1; V = 2,665.54 Den(Calc)= 4.01

Crystal System:

Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 6₃cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.752(1), 3.13(0.7), 3.96(0.51),3.76(0.49), 6.46(0.38), 5.43(0.33), 3.3(0.23), 9.87(0.23),

Crystal Structure:

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McDonald A M , Chao G Y , The Canadian Mineralogist , 43 (2005) p.747-758, Bobtraillite, (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12*12H2O,, a new mineral species from mont Saint-Hilaire, Quebec: description,, structure determination and relationship to benitoite and wadeite, Locality: Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada

Physical Properties of Bobtraillite

Color:

Gray, Pale green, Brown.

Diaphaniety:

Translucent

Luster:

Vitreous (Glassy)

Optical Properties of Bobtraillite

Gladstone-Dale:

CI calc= 0.21 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1586,KC= 0.2009

Optical Data:

Uniaxial (+), w=1.627, e=1.645, bire=0.0180.

Calculated Properties of Bobtraillite

Electron Density:

r_electron=3.83 gm/cc
note: r_Bobtraillite=4.01 gm/cc.

Fermion Index

Fermion Index = 0.04439
Boson Index = 0.95561

Photoelectric:

PE_Bobtraillite= 45.56 barns/electron
U=PE_Bobtraillite x r_electron= 174.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bobtraillite is Not Radioactive

Bobtraillite Classification

Dana Class:

59.2.2.6 (59)Cyclosilicate Three-Membered Rings

(59.2)hydrated

(59.2.2)Catapleiite group

59.2.2.1 Catapleiite (Na,Ca,[])2ZrSi3O9·2(H2O) B2/b (pseudo-HEX) 2/m

59.2.2.2 Calcium-catapleiite (Ca,[])ZrSi3O9·2(H2O) Pbnn 2/m 2/m 2/m

59.2.2.3 Gaidonnayite Na2ZrSi3O9·2(H2O) P 2₁nb mm2

59.2.2.4 Georgechaoite KNaZrSi3O9·2(H2O) P 2₁nb mm2

59.2.2.5 Loudounite NaCa5Zr4Si16O40(OH)11·8(H2O) Mono

59.2.2.6 Bobtraillite ! Na15Sr12Zr14Si42B6O138(OH)6·12(H2O) P 6₃cm 6mm

Strunz Class:

VIII/EX.00-00 VIII - Silicates

VIII/EX - Unclassified Strunz Cyklosilicates

VIII/EX.00 - Catapleiite group

Other Bobtraillite Information

See Also:

Links to other databases for Bobtraillite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Bobtraillite Specimen Label here :

Bobtraillite

Na15Sr12Zr14Si42B6O138(OH)6·12(H2O)
Dana No: 59.2.2.6 Strunz No: VIII/EX.00-00
Locality:

Notes: