Formula: Ca19(Al,Mg)13(B,Al)5Si18O68(O,OH,F)10
Origin of name: after locality, Wilui River, Yakutia, Russia
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 15.752, c = 11.717
Colour: Dark green
Diaphaneity:
Luster: Vitreous
Habit: Euhedral crystals
Hardness: 6
Specific gravity: 3.36
Cleavage: {100} poor
Tenacity: Brittle, irregular/uneven fracture
Streak: Colourless
Synonyms/varieties:
Comments:
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