Cohenite Herbstein F H, Smuts J Acta Crystallographica 17 (1964) 1331-1332 Comparison of X-ray and neutron-diffraction refinements of the structure of cementite Fe3C Locality: synthetic _database_code_amcsd 0019097 5.090 6.748 4.523 90 90 90 Pnma atom x y z Fed .186 .063 .328 Fec .036 .25 .852 C .89 .25 .45