Formula: KNa22(SO4)9(CO3)2Cl
Origin of name: For Henry Hanks, American mineralogist
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 10.47 Ǻ, c = 21.19 Ǻ
Colour: Colourless; yellowish, gray to grayish black
Diaphaneity:
Luster: Vitreous to dull
Habit:
Hardness: 3 to 3.5
Specific gravity: 3.56
Cleavage: 1; {0001} good
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Sometimes fluoresces weak yellow under LW
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