Formula: Na6(SO4)2FCl
Origin of name: from sulfur and Greek hals = salt
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell: a = 10.07 Å
Colour: colourless, gray, pale greenish yellow
Diaphaneity: transparent
Luster: vitreous to greasy
Habit: crystals dodecahedral, cubo-octahedral or octahedral, to 3 cm
Hardness: 3.5
Specific gravity: 2.51
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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