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Bixbyite is a manganese iron oxide mineral with formula: (Fe,Mn)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 and a specific gravity of 4.9 - 5.0. It is a somewhat rare mineral sought after by collectors as it typically forms euhedral isometric crystals exhibiting various cubes, octahedrons, and dodecahedrons.
Additional recommended knowledge
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. Typical localities are Siapa and Chhindwara, India and the Thomas Range in Juab County, Utah. It is also reported from San Luis Potosi, Mexico; northern Patagonia, Argentina; Gerona, Spain; Sweden and South Africa.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bixbyite". A list of authors is available in Wikipedia.|