Fergusonite 3-

Rare Earth Allanite Monazite Gadolinite Fergusonite Euxenite REE, Y, U Kobe, Japan Barringer Hill, Texas Ytterby, Sweden Shatford Lake, Manitoba... 

Other minerals containing REOE, such as fergusonite, priorite and samerskite are usually accessory minerals that contain tantalum, niobium, uranium and thorium. 

This hydroxamate is selective towards calcite, fluorite and sericite. The yttrium group minerals that contain zircon also have highly complex mineral compositions. These ores contain fergusonite, euxenite and priorit besides other minerals that contain REO. Such deposits are found in Northern Canada (Thor Lake). 

HREE Y, whereas monazite, allanite, synchysite and bastnaesite contain most of the LREE. Based on quantitative data approximately half of the fergusonite mass% is associated mainly with zircon, and <2% of the zircon with fergusonite (i.e., reflecting mass distribution differences in the samples). Therefore, in order to recover the HREE, both minerals must be processed and recovered together. The LREE carriers can be recovered as a group. 

Minerals such as euxenite, fergusonite, samarskite, polycrase and loparite are highly refractory and complex in nature. These minerals may be opened up by treatment with hydrofluoric acid. While metals such as niobium, tantalum and titanium form soluble fluorides, rare earth elements form an insoluble residue of their fluorides. Such insoluble fluorides are filtered out of solution and digested with hot concentrated sulfuric acid. The rare earth sulfates formed are dissolved in cold water and thus separated from the insoluble mineral impurities. Rare earth elements in the aqueous solution are then separated by displacement ion exchange techniques outlined above. 

Holium occurs in rare-earth minerals, such as monazite, gadolinite, xeno-time, euxenite, fergusonite, and bastnasite. Its concentration in monazite is about 0.05%. Its abundance in the earth s crust is 1.3mg/kg. 

Tantalum is never found in nature in free elemental form. The most important mineral is columbite-tantalite (Ee,Mn) (Nb,Ta)206. Tantalum also is found in minor quantities in minerals pyrochlore, samarskite, euexenite, and fergusonite. The abundance of tantalum in the earth s crust is estimated as 2 mg/kg. 

Thulium was discovered in 1879 by Cleve and named after Thule, the earliest name for Scandinavia. Its oxide thulia was isolated by James in 1911. Thulium is one of the least abundant lanthanide elements and is found in very small amounts with other rare earths. It occurs in the yttrium-rich minerals xenotime, euxenite, samarskite, gadolinite, loparite, fergusonite, and yttroparisite. Also, it occurs in trace quantities in minerals monazite and... 

Fergusonite. A natural inorg substance discovered among the feldspars of Norway, but it is found also in Sweden, USA and Africa. It is an oxide of yrrium, erbium, niobium tantalum — (Y, Er, Nb, Ta)04, contg small amounts of helium, cerium, uranium, etc. 

AVO4 (Zircon) and ANb04 (Fergusonite) compounds where A is a rare earth (Ce-Lu). The values for all the series except AASO4 were determined in this Laboratory (7 ). The results for AASO4 were obtained from National Bureau of Standards reports (8). 

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