Ktenasite

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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