Bobtraillite Mineral Data

General Bobtraillite Information

Chemical Formula:

(Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O

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

Empirical Formula:

Na_11.2Ca_1.22Sr_10.59Ba_0.16Zr_12.69Y_0.63Nb_0.61Hf_0.14Si_41.64B₆O₁₃₂(OH)₁₂·12(H₂O)

Environment:

Found in igneous breccias and nepheline syenite pegmatites.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Poudrette quarry, 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 his contributions to mineral ogy.

Synonym:

IMA2001-041

Bobtraillite Image

Images:

Bobtraillite

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

Bobtraillite Crystallography

Axial Ratios:

a:c = 1:0.50602

Cell Dimensions:

a = 19.72, c = 9.9788, Z = 1; V = 3,360.65 Den(Calc)= 3.12

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3c1

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

By Intensity(I/I_o): 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),

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

Cleavage:

None

Color:

Gray, Pale green, Brown.

Diaphaneity:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bobtraillite

Gladstone-Dale:

CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2038,KC= 0.2034
Ncalc = 1.63

Optical Data:

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

Calculated Properties of Bobtraillite

Electron Density:

Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Bobtraillite =3.12 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Bobtraillite= 49.66 barns/electron
U=PE_Bobtraillite x rElectron Density= 148.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bobtraillite is Not Radioactive

Bobtraillite Classification

Dana Class:

59.02.02.06 (59)Cyclosilicate Three-Membered Rings

(59.02)hydrated

(59.02.02)Catapleiite group

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

59.02.02.02 Calciocatapleiite (Ca,[])ZrSi3O9•2(H2O) Pbnn 2/m 2/m 2/m

59.02.02.03 Gaidonnayite Na2ZrSi3O9•2(H2O) P 2₁nb mm2

59.02.02.04 Georgechaoite KNaZrSi3O9•2(H2O) P 2₁nb mm2

59.02.02.05 Loudounite NaCa5Zr4Si16O40(OH)11•8(H2O) Mono

59.02.02.06 Bobtraillite! (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O P 3c1 3 2/m

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

References:

NAME( AmMin, v90, p1945) PHYS. PROP.(AmMin, v90, p1945) OPTIC PROP.(AmMin, v90, p1945)

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

Bobtraillite

(Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O
Dana No: 59.02.02.06 Strunz No: 09.CA.30
Locality:

Notes: