Formula: Cu3(Zn,Cu)4Cd2(AsO4)6 . 2H2O
Origin of name: For Charles Key, American dealer
Crystal system: Monoclinic
Crystal class: m or 2/m
Twinning:
Unit cell:
Colour: Deep sky-blue
Diaphaneity:
Luster:
Habit: Crystals prismatic to tabular
Hardness: 3.5 to 4
Specific gravity: 4.95
Cleavage: 1; {001} good
Tenacity:
Streak: Pale blue
Synonyms/varieties:
Comments:
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