Formula: Na7AlH2(CO3)4F4
Origin of name: For Willem Barents, Dutch seaman for whom the Barents Sea also is named
Crystal system: Triclinic
Crystal class: 1 or -1
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity:
Luster: Vitreous to pearly on cleavages
Habit: Small grains
Hardness: 3
Specific gravity: 2.56
Cleavage: 2; {001} and {110} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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