Formula: (Cu,Zn)5(SO4)2(OH)6 . 6H2O
Origin of name: For K. Ktennas, Greek mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.60 Ǻ, b = 6.12 Ǻ, c = 23.76 Ǻ, β = 95.6°
Colour: Emerald-green to deep blue-green
Diaphaneity:
Luster: Vitreous
Habit: Crystals, tabular, in groups
Hardness: 2 to 2.5
Specific gravity: 2.94
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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