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

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P.41<br />

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

Occurrence<br />

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

U uraninite U0 2 E pegmatites rapid in<br />

oxidizing conditions<br />

but<br />

very stable in<br />

reducing<br />

conditions<br />

carnotite K2 (U02 ) 2 (V04 ) 2 E<br />

sandstone relatively<br />

tyuyamunite Ca(U02)2(V04)2 E insoluble<br />

autunite Ca(U0 2 ) 2 (P0 4 ) 2 E pegmatites, insoluble<br />

sandstone,<br />

K-autunite K 2 (U0 2 ) 2 (P0 4 ) 2 E sedimentary<br />

breccia<br />

Sr-autunite Sr(U0 2 ) 2 (P0 4 ) 2 E<br />

phosphuranylite Ca(U0 2 ) 4 (PO 4 ) 2 (OH) 4 7H20 E U-schists,<br />

pegmatites<br />

ningyoite (U,Ca,Ce) 2 (P0 4 ) 2 1-2H 2 0 E sedimentary<br />

rocks<br />

lermontovite (U,Ca,Ce) 3 (P0 4 ) 4 6H 2 0 E<br />

c<strong>of</strong>finite U(SiO 4 )1-x(OH) 4x E sandstone,<br />

sedimentary<br />

breccia,<br />

U-schists<br />

ekanite (Th,U)(Ca,Fe,Pb) 2 Si 8 0 20 SS pegmatite<br />

veins<br />

weeksite K 2 (U0 2 ) 2 Si 6 01 5 4H20 E<br />

soddyite (U0 2 ) 5 Si 2 09 6H 2 0 E pegmatite<br />

(a) Substitution <strong>of</strong> radionuclide into host mineral: E = essential element; SS = solid solution; R = replacement<br />

<strong>of</strong> another element by radionuclide.

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