Formula: Na3AlF6
Origin of name: From Greek for frost
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common by at least 13 distinct twin laws, penetration or polysynthetic
Unit cell: a = 7.77 Å, b = 5.59 Å, c = 5.40 Å, β = 90.2°
Colour: Colourless, white, golden yellow, brownish, reddish
Diaphaneity:
Luster: Vitreous to greasy
Habit: Crystals cuboidal or short prismatic; massive, coarse granular
Hardness: 2.5
Specific gravity: 2.97
Cleavage: 2; {001} and {110} parting
Tenacity: Uneven; brittle
Streak: White
Synonyms/varieties:
Comments:
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