Formula: (Na,Ca)13Sr11(Zr,Y,Nb)14[(Si3O9)10|(H2BSi2O9)6] · 12H2O
Origin of name: Honouring Robert (Bob) J. Traill, formerly mineralogist at the Geological Survey of Canada, Ottawa
Crystal system: Trigonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 19.72, c = 9.9788
Colour: Gray to brown
Diaphaneity: Transparent
Luster: Vitreous
Habit: Blocky to prismatic, elongated along [001]
Hardness: 5.5
Specific gravity: 316
Cleavage: None observed
Tenacity: Brittle, irregular/uneven, conchoidal fracture
Streak: White
Synonyms/varieties:
Comments:
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