COHENITE

the mineral iron and nickel carbide [(Fe,Ni)3C] that occurs as an accessory constituent of several iron meteorites, of all coarse octahedrites containing 7 percent or less nickel, and of at least one stony meteorite, an enstatite chondrite. Cohenite closely resembles the meteoritic mineral schreibersite, and it may be more common in meteorites than is supposed. When man-made, as in steel, it is called cementite. For detailed physical properties, see native element (table).