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Diffraction patterns for monolith samples exposed to YCWCa for 622 days at a 30 °C and b 70 °C. Phases indexed at 70 °C were: rhodesite [(Ca,Na2,K2)8Si16O40·11H2O, PDF 00-022-1253];36 phillipsite-K [Na4KAl5Si11O32·10H2O, PDF 01-073-1419];37 and silicon oxide [SiO2, PDF 01-082-1573]38