Bobtraillite
Bobtraillite is an IMA-recognized mineral species in the silicate class, with the chemical formula (Na,Ca)₁₃Sr₁₁(Zr,Y,Nb)₁₄Si₄₂B₆O₁₃₂(OH)₁₂·12H₂O.
It crystallizes in the hexagonal crystal system (space group P-3c1).
Key properties: Mohs hardness 5.5; specific gravity 3.16; White streak; Vitreous luster; optically uniaxial.
IMA symbol Bta, IMA status: approved, named in 2001.
A late hydrothermal mineral in cavities in igneous breccia and nepheline syenite pegmatite.
It is found associated with An unnamed burbankite-group mineral, donnayite-(Y), clinoamphibole, albite, aegirine, pyrrhotite, pyrite, annite, analcime, microcline.
The mineral was named to honor Dr. Robert (“Bob”) James Traill (b. 1921), mineralogist and former head of the Mineralogy Section at the Geological Survey of Canada, Ottawa (1953-1986).