Crystallographic Data. 131. Uranium (IV) Pyrophosphate, UP2O7

Optical Properties. Refractive Indices (5893 A.), nx. = 1.727, nr. = 1.745, nz = 1.757, all ±0.005; geometric mean. 1.743. Molecular refraction. 19.8...
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V O L U M E 28, NO. 7, J U L Y 1 9 5 6

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OPTICALPROPERTIES Refractive Indices (5893 A