Cornetite

Formula:  Cu3(PO4)(OH)3

 

Origin of name:  For Jules Cornet, Belgian geologist

 

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning: 

Unit cell: a = 10.88 Å, b = 14.10 Å, c = 7.11 Å

 

Colour:  Dark blue to greenish blue

Diaphaneity: 

Luster:  Vitreous

Habit:  Crystals short prismatic to equant; crusts of minute crystals

Hardness:  ~ 4.5

Specific gravity:  4.10

Cleavage:  None

Tenacity:  Brittle

Streak:

 

Synonyms/varieties:

 

Comments:

 

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