Cornwallite

Formula:  Cu5(AsO4)2(OH)4 . H2O

 

Origin of name:  Locality; Cornwall, England

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 17.41 Å, b = 5.78 Å, c = 4.61 Å, β = 92.0°

 

Colour:  Light green to dark green

Diaphaneity:

Luster:  Dull, slightly resinous

Habit:  Radiating botryoidal crusts

Hardness:  4.5

Specific gravity:  4.52

Cleavage:  None

Tenacity:  Conchoidal

Streak:

 

Synonyms/varieties:

 

Comments:

 

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