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

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P.36<br />

TABLE P.3.1. Selected Host Minerals for Radionuclides<br />

Occurrence<br />

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

Cs pollucite Cs 2 -xNaxAl 2 Si 4 012 H20 E granite<br />

pegmatites<br />

Sr anorthite<br />

(feldspar)<br />

Cal-xNaxAl2-xSi2+xO8 R basalt slow breakdown<br />

into<br />

clay minerals<br />

under surface<br />

weathering<br />

conditions<br />

Sr-apatite Sr 5 (P0 4 ) 3 (OH,F) E alkalic<br />

pegmatites<br />

belovite (Sr,Ce,Na,Ca) 5 (PO 4 ) 3 (0,OH) SS alkalic breakdown at<br />

pegmatites low pH<br />

celestine SrSO 4 E oxidation zones<br />

in sulfur<br />

deposits primary<br />

precipitation<br />

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

ore deposits<br />

goyazite SrA1 3 (P0 4 ) 2 (OH) 5 H 2 0 E pegmatite<br />

lamprophyllite Na 2 (Sr,Ba) 2 Ti 3 (SiO 4 (OH,F) 2 SS nepheline syenites<br />

alkali-rich<br />

pegmatites<br />

lusangite (Sr,Pb)Fe 3 (P0 4 ) 2 (OH)5-H 2 0 SS pegmatite<br />

bogildite Na 2 Sr 2 A1 2 PO 4 F9 E cryolite<br />

danburite CaB 2 Si 2 0 8 R andesite<br />

attakolite (Ca,Mn,Sr) 3 A1 6 (PO 4 ,SO 4 ) 7 -3H 2 0 SS<br />

cuspidine Ca4Si 2 0 7 (F,OH) 2 R metamorphic<br />

rocks limestonecontact<br />

zones<br />

deposits<br />

xenoliths<br />

rankinite Ca 3 Si 2 0 7 R strain gelatinizes<br />

melilite Ca 2 Mgl-xAl2xSi2-x07 R extrusive<br />

rocks<br />

umbozerite Na 3 Sr 4 ThSi 8 (0,OH) 2 4 E<br />

scheelite CaWO 4 R pegmatites<br />

powellite CaMo0 4 R pegmatites<br />

zones readily at<br />

low pH

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