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 somewhat rare mineral sought after by collectors as it typically forms euhedral isometric crystals exhibiting various cubes, octahedrons, and dodecahedrons. 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 commonly associated with beryl, quartz, spessartine, hematite, pseudobrookite, hausmannite, braunite and topaz in pneumatolytic or hydrothermal veins and cavities and in metamorphic rocks. Type 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. Bixbyite was named for the American mineralogist M. Bixby. General Name, Symbol, Number manganese, Mn, 25 Chemical series transition metals Group, Period, Block 7, 4, d Appearance silvery metallic Atomic mass 54. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... An oxide is a chemical compound of oxygen with other chemical elements. ... In crystallography, the cubic crystal system (or isometric crystal system) is the most symmetric of the 7 crystal systems. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... This article is about the mineral, for the rifle see Beryl assault rifle. ... Quartz is the second most abundant mineral in the Earths crust. ... The Garnet group of minerals show crystals with a habit of rhombic dodecahedrons and trapezohedrons. ... Hematite (AE) or haematite (BE) is the mineral form of Iron (III) oxide, (Fe2O3), one of several iron oxides. ... Braunite is a grey/black mineral, an oxide of manganese, named after Mr. ... This article is about the mineral or gemstone, for other uses see: Topaz (disambiguation). ... Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means change in form, derived from the Greek words meta, change, and morphe, form. The protolith is subjected to extreme heat (>150 degrees Celsius) and pressure causing profound... Chhindwarwa is a city and district situated in Madhya Pradesh, India. ... Juab County is a county located in the state of Utah. ... San Luis Potosí is the name of a city and a state in Mexico. ... Patagonia is that portion of South America which, to the east of the Andes, lies mainly south of the Rio Negro (41°S), and, to the west of the Andes, south of (42°S). ...

External links

• Mindat
• Webmineral
• Mineral galleries
• Utah Geological Survey