Formula: HNa2LiAl(PO4)2(OH)
Origin of name: after locality Tanco spodumene-bearing pegmatite mine at Bernic Lake, MB, Canada.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 7.041, b = 14.13, c = 6.975
Colour: Colourless to pale pink
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals to 1 mm, singles, or druses or columnar crystals
Hardness: 4 to 4.5
Specific gravity: 2.75
Cleavage: 2; {010} and {001} distinct
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties:
Comments:
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