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

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P.46<br />

TABLE P.4.1. Uranium and Thorium Content (wt%) <strong>of</strong> Non-Metamict and Metamict AB 20 6 --<br />

Type Nb-Ta-Ti Oxides<br />

Non-metamict<br />

U3Og- ThO2_<br />

euxenite (Nefedor 1956) (a) (a)<br />

fersmite (Alexandrov 1966) (a) (a)<br />

aeschynite (Alexandrov 1962 and 1966) not detected 0.72<br />

allanite (Cech, Vrana and Povondra 1972) 0. 2 5(b) 2.26<br />

lyndochite (Gorzhevskaya and Sidorenko 1962) 0. 0 8 (c) 3.75<br />

Metamict<br />

euxenite (mean value <strong>of</strong> 28 analyses) 9.31 3.08<br />

aeschynites (mean value (<strong>of</strong> 22 analyses) 1.2 10.73<br />

(a) Semiquantitative analysis, no U or Th reported.<br />

(b) Analysis by R. C. Ewing, University <strong>of</strong> New Mexico.<br />

(c) Reported as U0 3 .<br />

TABLE P.4.2 <strong>Radioactive</strong> Minerals Reported as Always Crystalline(a)<br />

autunite Ca(U0 2) 2"10-12H 20<br />

bastnaesite (Ce,La)(CO 3)F<br />

carnotite K 2 (U0 2) 2 (VO 4 ) 2"3H 20<br />

columbite (Fe,Mn)(Nb,Ta) 20 6<br />

gummite U0 3 *nH20<br />

huttonite(b) ThSiO 4<br />

metatorbernite Cu(U0 2 ) 2 (PO 4) 2 -8H 20<br />

(b )<br />

monazite<br />

(Ce,Th)PO 4<br />

stibiotantalite Sb(Ta,Nb)0 4<br />

thorianite(b) ThO2<br />

thortveitite (Sc,Y) 2Si 20 7<br />

tyuyamunite Ca(UO 2) 2(VO 4 ) 2 .nH20<br />

uvanite U 2V 60 2 1 *15H 20<br />

( b )<br />

xenotime<br />

(Y,U)PO 4<br />

yttr<strong>of</strong>luorite Ca 3YF 9<br />

titanite CaTiSiO 5<br />

( b )<br />

uranite<br />

U0 2<br />

baddeleyite(a) ZrO 2<br />

(a) After Ueda (1957).<br />

(b) Primary phases which are invariably crystalline,<br />

even with high concentrations <strong>of</strong> uranium<br />

and throium. Note that in some rare caaes even<br />

these minerals have been reported as being partially<br />

metamict.<br />

( b )

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