...Karin Popa; Tatiana Shvareva; Lena Mazeina; Eric Colineau; Franck Wastin; Rudy J.M. Konings; Alexandra Navrotsky Abstract The mineral cheralite [CaTh(PO 4 ) 2 ] allows for the incorporation of tetravalent actinides in monazite-based crystalline phases. Experimental determination of its...

...Kees Linthout Abstract The nomenclature for the system 2REEPO 4 – CaTh(PO 4 ) 2 – 2ThSiO 4 has been revised, to be consistent with CNMMN principles. Henceforth, only three names will be applied to members dominated by the respective end-member compositions monazite, cheralite, and huttonite...

...J. J. Finney; N. Nagaraja Rao Abstract The structure of cheralite, a thorium, calcium, rare earth monazite, has been completely redetermined. Patterson sections and three-dimensional difference maps were used to determine the atomic positions, and least squares refinement of the data reduced the R...

...N. Nagaraja Rao; J. J. Finney Abstract Bowie and Horne (1953) described cheralite as a green mineral belonging to the monazite group intermediate in composition between monazite and the compound CaTh(PO 4 ) 2 . They presented chemical analyses from two supposedly different localities: Kuttakuzhi...

... ilmenite-series granitic pegmatite. The observed variations in their chemical composition are largely explained by the huttonite exchange [(Th + U) 4+ ↔Si 4+ ], and subordinately by the cheralite exchange [(Th + U) 4+ ↔2Ca 2+ ]. However, there are differences in the degree of contribution of the two...

... of brabantite and the first occurrence of this mineral in a granite. Many new occurrences of cheralite-(Ce), as well as a monazite-group mineral intermediate between monazite-(Ce) and huttonite for which the term huttonitic monazite is proposed, were discovered. Even "common" monazite-(Ce) may show extreme...

... percent) is also present; silica is nearly absent (0.16 percent). From these data, relationships to cheralite are evident, and the mineral might be considered as a uranium-rich cheralite, or as its uranium-bearing equivalent; the name monazite is used on account of the ratio (Ca + U + Th)/(Ce + La + Pr...

..., and contains up to 44.88% TiO 2 , 3.12% Nb 2 O 5 , 6.52% Y 2 O 3 , 0.80% Dy 2 O 3 , 2.63% ThO 2 , 6.0% P 2 O 5 , and 3.73% F. Electron microprobe analyses of xenotime-(Y) overgrowths on zircon show that oscillatory zoning is a result of variable Th and Ca content. Cheralite-type substitution, whereby Th and Ca...