Formula: Zn3 (AsO4)2 . 8H2O
Origin of name: For Otto Köttig, German chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 10.13 Ǻ, b = 13.34 Ǻ, c = 4.71 Ǻ, β = 103.8°
Colour: Carmine red, brownish
Diaphaneity:
Luster: Silky on fracture
Habit: Crystals prismatic; massive; fibrous crusts
Hardness: 2.5 to 3
Specific gravity: 3.33
Cleavage: 1; {010} perfect
Tenacity:
Streak: Reddish white
Synonyms/varieties:
Comments: Series with parasymplesite
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