Formula: KNa2B3Si12O30
Origin of name: for the Poudrette family, Canadian quarry owner
Crystal system: hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity: transparent
Luster: vitreous
Habit: equant, barrel-shaped prisms to 5 mm
Hardness: 5
Specific gravity: 2.51
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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