Coulsonite

Formula:  FeV2O4

 

Origin of name:  For Arthur Coulson, Indian Geological Survey

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell:

 

Colour:  Bluish gray

Diaphaneity:  Opaque

Luster:  Metallic

Habit:  Crystals subhedral, microscopic

Hardness:  4.5 to 5

Specific gravity:  5.17 to 5.20

Cleavage:  None

Tenacity:

Streak:  Dark brown to black

 

Synonyms/varieties:

 

Comments:

 

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