Bixbyite is a manganese iron oxide mineral with chemical formula: (Mn,Fe)2O3.

[3] It is a somewhat rare mineral sought after by collectors as it typically forms euhedral isometric crystals exhibiting various cubes, octahedra, and dodecahedra.

It is commonly associated with beryl, quartz, spessartine, hematite, pseudobrookite, hausmannite, braunite and topaz in pneumatolytic or hydrothermal veins and cavities and in metamorphic rocks.

[3] Typical localities are Jhabua and Chhindwara districts, India and the Thomas Range in Juab County, Utah.

It is also reported from San Luis Potosi, Mexico; northern Patagonia, Argentina; Girona, Catalonia, Spain; Sweden, Germany, Namibia, Zimbabwe, and South Africa.