Phosphate-silicate of Th, Ca, and rare earths.
Isostructural with monazite, conforming to monazite formula type AXO4
with A=Th, Ca, Ce, La, U, Pb; X=P, Si. Cheralite is essentially an
intermediate member of a solid-solution series apparently extending between
monazite, CePO4, and CaTh(PO4)2, known only
as an artificial compound.
U = 3.5 to 5.5 percent, Th = 25.9 to 27.7 percent.
Color: Green. Rare, from granite pegmatite.
Source: Frondel, Judith Weiss and Michael Fleischer. 1955. Glossary of
Uranium- and Thorium-Bearing Minerals, Third Edition. Washington DC: United
States Government Printing Office