Bixbyite
Bixbyite is a manganese iron oxide mineral with chemical 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, octahedra, and dodecahedra.
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Bixbyite Crystals on Topaz
(May differ to photo) £7.20SIZE: 10-20mm (Range)
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Bixbyite Crystals on Topaz
(Actual as seen) £8.40SIZE: 13 x 10 x 6mm
(0.51 x 0.39 x 0.24 inches)
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