Melanothallite

Formula:  Cu2OCl2

Origin of name:  From Greek for black and young sprout

 

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning: 

Unit cell: 

 

Colour:  Black to bluish black

Diaphaneity: 

Luster:  Vitreous

Habit:  Plates to 1 cm across

Hardness

Specific gravity:  4.08

Cleavage:  1; perfect

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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