There are at least four different kinds of monazite, depending on relative elemental composition of the mineral: monazite-(Ce), (Ce, La, Nd, Th)PO4 (the most common member), monazite-(La), (La, Ce, Nd)PO4, monazite-(Nd), (Nd, La, Ce)PO4, monazite-(Sm), (Sm, Gd, Ce, Th)PO4.
Setidaknya ada empat jenis monasit, tergantung pada komposisi relatif unsur di dalam mineral: monasit-(Ce), (Ce, La, Nd, Th)PO4 (anggota yang paling umum ), monasit-(La), (La, Ce, Nd)PO4, monasit-(Nd), (Nd, La, Ce)PO4, monasit-(Sm), (Sm, Gd, Ce, Th)PO4.