of all the 14 naturally occurring members of the group, but commonly the assemblage in any one species...regularly in the American Mineralogist. Rare-earth group of elements [Includes the lanthanide elements and...a naturally occurring member of the rare-earth group Glossary of rare-earth minerals Name Composition...- - - (Y, Ca, H) Cu6 [(As04)3 (OH) 6 ] • 3H20 Allanite - - - - - - (Ca, Ce, Thh (AI, Fe, Mg)a Si3012(0H)...- - Resembles bastnaesite Belovite- - - Apatite group - (Sr, Ce, Na, Ca)5 (P04)a (OH)- - - RE varieties |