Bixbyite

Formula:  (Mn,Fe)2O3

Origin of name:  For M. Bixby, American

 

Crystal system:  Cubic

Crystal class:  2/m -3

Twinning:  On {111}, penetration

Unit cell: a = 9.411 Ǻ

 

Colour:  Black

Diaphaneity:

Luster:  Brilliant metallic to submetallic

Habit:  Crystals cubic

Hardness:  6 to 6.5

Specific gravity:  4.945

Cleavage:  1; {111} in traces

Tenacity:

Streak:  Black

 

Synonyms/varieties:  Patridgeite (Fe-poor variety)

 

Comments:

 

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