Nichromite

Formula: (Ni,Co,Fe)(Cr,Fe,Al)2O4

Origin of name: from nickel and chromite

 

Crystal system: cubic

Crystal class: 4/m -3 2/m

Twinning: 

Unit cell: 

 

Colour: black

Diaphaneity: opaque

Luster: metallic

Habit: 

Hardness

Specific gravity: 5.24

Cleavage: none

Tenacity: 

Streak: greenish gray

 

Synonyms/varieties:

 

Comments: 

 

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