Monazite in a granite pegmatite from Yamanoo, Sakuragawa, Ibaraki Prefecture, Japan has been examined terms of U, Th, Pb, and rare earth element (REE) chemistry by electron microprobe analysis. This occurs as lenticular vein the Kabasan granitic body. Oscillatory sector zoning were observed back-scattered images. An averaged empirical formula was (Ce0.286Nd0.180Sm0.104La0.077Y0.069Pr0.041Gd0.06...