Formula: NaMg3V6(BO3)3Si6O18(OH)4
Origin of name: for its vanadium content and the mineral dravite.
Crystal system: Hexagonal
Crystal class: 3m
Twinning:
Unit cell: a = 16.12, c = 7.39
Colour: Dark green, black
Diaphaneity: Translucent to opaque
Luster: Resinous
Habit: Prismatic, euhedral
Hardness: 7.5
Specific gravity: 3.32
Cleavage: {101 and {110} distinct
Tenacity: Brittle, conchoidal fracture
Streak: Yellowish brownish green
Synonyms/varieties:
Comments:
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