No abstract

Minerals of the monazite structural group include arsenates, phosphates, and silicates with the general formula AB04 where A = Bi, Ca, Ce, La, Nd, Th, U, and/or Y; and B = P+5 s As+^, and/or Si+5. Monazite-family minerals contain essential REE and P04, and may have minor amounts of other elements. Monazite-(Ce) is the predominant species, constituting 763 analyses (Tables 1 to 3). Another 18 analyses are for other species of monazite and gasparite-(Ce) (Table 4), cheralites (Table 5), and huttonites (Table 6). Two additional tables list average compositions of monazite-(Ce) from various rock types, and a final table indexes the analyses of monazite-(Ce) according to the localities.