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Figure 2
Crystal structure of phurcalite. (a) Uranyl phosphate sheet of the phosphuranylite topology containing UO22+ coordinated both as UO7 (U1 and U2) and UO8 bipyramids. (b) Stacking of the sheets perpendicular to b. Adjacent sheets are linked by an extensive hydrogen bonding network (bonds are omitted for clarity). Color scheme: U is yellow, P is pink, Ca is violet, O is red, H is gray; unit-cell edges are outlined as black solid lines.

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