Bond distances in the bequerelite crystal structure (in Å).

Bond	Exp.48	Exp.50	Calc.	Bond	Exp.48	Exp.50	Calc.
U1				U4
U1–O2	1.81(4)	1.77(1)	1.819	U4–O8	1.77(3)	1.792(9)	1.789
U–O1	1.91(4)	1.80(1)	1.835	U4–O7	1.83(3)	1.799(9)	1.816
U(1)–O13	2.20(6)	2.23(1)	2.213	U4–O16	2.20(8)	2.21(1)	2.247
U(1)–O14	2.31(7)	2.23(1)	2.229	U4–O14	2.33(8)	2.24(1)	2.255
U(1)–OH3	2.29(8)	2.39(1)	2.411	U4–OH6	2.35(10)	2.37(1)	2.402
U(1)–OH2	2.38(9)	2.51(2)	2.463	U4–OH3	2.45(10)	2.46(1)	2.406
U(1)–OH1	2.53(8)	2.64(1)	2.623	U4–OH2	2.61(4)	2.602(8)	2.772
Aver. U–Oeq.	2.34	2.40	2.388	Aver. U–Oeq.	2.39	2.38	2.416
U2				U5
U2–O4	1.80(3)	1.786(9)	1.803	U5–O10	1.71(5)	1.78(1)	1.801
U2–O3	1.86(4)	1.79(1)	1.825	U5–O9	1.79(4)	1.79(1)	1.832
U2–O15	2.28(6)	2.23(1)	2.250	U5–O14	2.14(8)	2.23(1)	2.233
U2–O13	2.39(7)	2.24(1)	2.262	U5–O13	2.29(5)	2.25(1)	2.234
U2–OH5	2.42(8)	2.41(1)	2.417	U5–OH4	2.45(14)	2.40(2)	2.390
U2–OH1	2.47(8)	2.43(1)	2.428	U5–OH1	2.47(7)	2.43(1)	2.405
U2–OH4	2.70(4)	2.64(1)	2.667	U5–OH3	2.58(10)	2.66(1)	2.751
Aver. U–Oeq.	2.45	2.39	2.405	Aver. U–Oeq.	2.45	2.39	2.403
U3				U6
U3–O6	1.74(4)	1.79(1)	1.798	U6–O11	1.83(5)	1.79(1)	1.817
U3–O5	1.77(4)	1.82(1)	1.831	U6–O12	1.86(4)	1.82(1)	1.833
U3–O16	2.06(6)	2.23(1)	2.218	U6–O15	2.21(8)	2.23(1)	2.226
U3–O15	2.20(6)	2.23(1)	2.266	U6–O16	2.23(6)	2.25(1)	2.243
U3–OH6	2.42(9)	2.39(1)	2.405	U6–OH5	2.32(7)	2.40(1)	2.373
U3–OH2	2.58(8)	2.41(2)	2.447	U6–OH4	2.32(14)	2.41(2)	2.399
U3–OH5	2.61(8)	2.61(1)	2.612	U6–OH6	2.82(11)	2.80(1)	2.642
Aver. U–Oeq.	2.37	2.40	2.390	Aver. U–Oeq.	2.38	2.42	2.403
Ca
Ca–OW3	2.41(11)	2.36(2)	2.301	Ca–OW2	2.42(7)	2.45(1)	2.480
Ca–O12	2.33(5)	2.37(1)	2.358	Ca–OW1	2.51(7)	2.47(1)	2.519
Ca–O1	2.45(4)	2.44(1)	2.423	Ca–OW4	2.62(7)	2.58(1)	2.529
Ca–O5	2.45(5)	2.45(1)	2.480	Aver. Ca–O	2.45	2.45	2.441