is one of the most ubiquitous minerals, occuring in a great variety of igneous, metamorphic and sedimentary rocks, typically as disseminated. Britannica online encyclopedia article on magnetite: iron oxide mineral (FeFe2O4, or Fe3O4) that is the chief member of one of the series of the spinel (qv). Click Here for Larger Magnetite Image in a New Browser Window Images:. Comments: Black, opaque octahedral crystals of magnetite on matrix. . magnetite is American Psycho an iron oxide. Coarse granular magnetite crystals: Fe3O4. (Courtesy of OCW.) Magnetite is a widespread accessory

mineral in rocks and soils. As was first shown by Lowenstam (1962), magnetite frequently forms also by biochemical. magnetite is an iron oxide. Coarse granular magnetite crystals: Fe3O4.

(Courtesy of OCW.) magnetite , Understanding Changes lustrous