bixbyite

bixbyite

Bixbyite is a manganese iron oxide mineral with formula: (Mn,Fe)₂O₃. The iron/manganese ratio is quite variable and many specimens have almost no iron. It is a metallic dark black with a Mohs hardness of 6.0 - 6.5. It is a somewhat rare mineral sought after by collectors as it typically forms euhedral isometric crystals exhibiting various cubes, octahedrons, and dodecahedrons.

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Industry/Domain: Geology; Mining
Category: Minerals
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