The uranophane group includes:
boltwoodite:
(K,Na)(UO2)(SiO3OH).1.5H2O
parauranophane:
Ca(UO2)2(SiO3OH)2.5H2O
uranophane:
Ca(U6+O2)2(SiO3OH)2.5H2O
Group members are uranyl silicates with U:Si equal to 1:1
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