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Management of Commercially Generated Radioactive Waste - U.S. ...

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P.40<br />

TABLE P.3.1. (continued)<br />

Occurrence<br />

Element Host Mineral Formula Substitution(a) in Nature Alteration<br />

Lantha- columbite (Fe,Mn)(Nb,Ta) 2 0 6 R granites,peg- very resistant<br />

nide, matites, quartz to weathering<br />

Acti- tantalite (Fe,Mn)(Ta,Nb) 2 0 6 R\ veins, greisen<br />

nideI deposits,<br />

placers<br />

perovskite CaTiO 3 R basic igneous can be altered<br />

rocks to metaloparite<br />

but<br />

loparite (Na,Ce,Ca)(Ti,Nb)0 3 SS alkali retains<br />

syenites I lanthanides<br />

aeschynite (Ce,Nd,Th,Y)(Ti,Nb) 2 0 6 SS<br />

polymignyte (Ca,Fe,Ce)(Zr,Ti,Nb) 2 0 6 SS alkali massifs usually<br />

pegmatites weathers<br />

sinicite (Ce,Nd,Th,U)(Ti,Nb)20 6 SS<br />

fergusonite YNb0 4 E granitoid for- fairly stable<br />

mations, <strong>of</strong>ten ass<strong>of</strong>ormanite<br />

YTa0 4 El placers, gran- ciated with<br />

ites, pegma- monazite in<br />

tites' placers<br />

samarskite (Fe,Y,U,)(Nb,Ti,Ta) 2 0 7 SS pegmatites,<br />

gold placers<br />

pyrochlore (Na,Ca,U,Ce,Y) 2-x<br />

(Nb,Ta,Ti) 2 06-x(OH,F)i+x SS<br />

betafite (U,Ca 2 -x(Nb,Ti,Ta)2<br />

06-x(OH1+x<br />

zirconolite CaZrTi 2 ) 7 R<br />

microlite (Ca,Na) 2 Ta 2 0 6 (0,OH,F) R Alkali rock pervasively<br />

massifs altered<br />

obruchevite (Y,U,Ca)2-xNb20 6 (OH) SS<br />

djalmaite (Ca,Na,U) 2 Ta 2 0 6 (0,OH,F) SS<br />

pandaite (Ba,Sr) 2-(Nb,Ti) 207-x07H20 R<br />

SS

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