| | Conference Paper/Abstract | Conference GEOCHEMISTRY AND MINERALOGY OF THE LEMHI PASS REE-Th DEPOSITS: AN EXAMPLE OF REE-TH MOBILITY. P. E...The Lemhi Pass REE-Th deposits sits astride the continental divide partially in Beaverhead County, Montana...Montana and, partially in Lemhi County, Idaho. Mineralization occurs in veins with potassic alteration...76-0.95Ca0-0.06P0.95-1.05O4), xenotime ((Y, REE)PO4) and allanite ((REE,Ca,Y)2(Al,Fe3+)3(SiO4)4(OH)), with...with monazite hosting much of the REE. Xenotime and allanite compositions have only been determined qualitatively | | | Report (volume) | (Ce) or yttrium VII MINERALS OF THE RARE EARTHS (Y); for example, the formula for calkinsite is given...63 - 64 65 - 66 - 67 - 68 - 69 70 71 Yttrium (Y)- - - 39 'Promethium is a radioactive element with...Thorian brannerite- - - - - - - - ·· Abukumalite - (Y, Ce, Ca) 5 (Si0 4 , P0 4 ) 3 (0, OH, F) Aeschynite...20 6 - - - - - Also eschynite Agardite - - - - - (Y, Ca, H) Cu6 [(As04)3 (OH) 6 ] • 3H20 Allanite - -...) 2 (OH) · H 20- - - - - - Ashcroftine - K Na Ca [Y(OHhb [Si60 12 (OH) 6 ] • 4H 20 - Tentative formula |
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