Cochromite

Formula:  (Co,Ni,Fe)(Cr,Al)2O4

Origin of name:  From Cobalt and chromium

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell:

 

Colour:  Black

Diaphaneity:

Luster:  Metallic

Habit:

Hardness:

Specific gravity:  5.22

Cleavage:  None

Tenacity:

Streak:  Greenish gray

 

Synonyms/varieties:

 

Comments:

 

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