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Bobtraillite

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Bob Traill
Formula:
(Na,Ca)13Sr11(Zr,Y,Nb)14(Si3O9)10(H2BSi2O9)6 · 12H2O
Colour:
grey to brown
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.16 (Calculated)
Crystal System:
Trigonal
Name:
Honouring Robert ("Bob") James Traill (1921-2011) mineralogist and former head of the Mineralogy Section at the Geological Survey of Canada (1953–1980).
A complex zirconium silicate, consisting of isolated (ZrO6) octahedra that are linked by trisilicate (Si3O9) rings to form a pinwheel-like motif similar to that found in Wadeite. Additional trisilicate (Si3O9) and boro-trisilicate (H2BSi2O9) rings complete a two-dimensional, giant pinwheel motif along [001]. Bonding between the rings and the (ZrO6) octahedra along [001] completes the structure in three dimensions. Channels along [001] are occupied by Na and Sr ions and water molecules.


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Classification of BobtrailliteHide

Approved
Approval Year:
2001
9.CA.30

9 : SILICATES (Germanates)
C : Cyclosilicates
A : [Si3O9]6- 3-membered single rings (dreier-Einfachringe), without insular complex anions

Physical Properties of BobtrailliteHide

Vitreous
Transparency:
Transparent
Colour:
grey to brown
Streak:
white
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.16 g/cm3 (Calculated)

Optical Data of BobtrailliteHide

Type:
Uniaxial (+)
RI values:
nω = 1.627 nε = 1.645
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of BobtrailliteHide

Formula:
(Na,Ca)13Sr11(Zr,Y,Nb)14(Si3O9)10(H2BSi2O9)6 · 12H2O
IMA Formula:
(Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12 · 12H2O
Common Impurities:
Ba,Hf

Crystallography of BobtrailliteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3 1c
Cell Parameters:
a = 19.72 Å, c = 9.9788 Å
Ratio:
a:c = 1 : 0.506
Unit Cell V:
3360.7 ų
Z:
1
Morphology:
Commonly blocky to prismatic, elongate along [001].

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.752 (100)
3.13 (70)
3.96 (51)
3.76 (49)
6.46 (38)
5.43 (33)
Comments:
Format: d (I) (hkl). Only the six strongest lines are given.

Type Occurrence of BobtrailliteHide

General Appearance of Type Material:
generally isolated single crystals with a maximum length of 2 mm or simple parallel intergrowths with two or three members, rarely in small (<0.1 mm) rosettes
Geological Setting of Type Material:
The mineral is found in igneous breccias and nepheline syenite pegmatites. It is paragenetically late, arising from unusual, hydrous fluids enriched in B, Sr, Na and Zr.
Associated Minerals at Type Locality:

Synonyms of BobtrailliteHide

Other Language Names for BobtrailliteHide

Simplified Chinese:水硼硅锶钠锆石
Traditional Chinese:水硼矽鍶鈉鋯石

Related Minerals - Nickel-Strunz GroupingHide

9.CA.05BaziriteBaZr(Si3O9)Hex.
9.CA.05BenitoiteBaTi(Si3O9)Hex. 6 m2 : P62c
9.CA.05PabstiteBa(Sn,Ti)(Si3O9)Hex.
9.CA.10WadeiteK2Zr(Si3O9)Hex.
9.CA.15CalciocatapleiiteCaZr(Si3O9) · 2H2O
9.CA.15CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
9.CA.20PseudowollastoniteCaSiO3
9.CA.25MargarosanitePb(Ca,Mn2+)2(Si3O9)Tric. 1 : P1
9.CA.25WalstromiteBaCa2(Si3O9)Tric.

Fluorescence of BobtrailliteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BobtrailliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
McDONALD, A.M., and CHAO, G.Y. (2005) 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. Canadian Mineralogist, 43, 747-758.

Internet Links for BobtrailliteHide

Localities for BobtrailliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
McDONALD, A.M., and CHAO, G.Y. (2005) 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. Canadian Mineralogist, 43, 747-758.
Mineral and/or Locality  
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