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

brown coloring, optically isotropic; and (2) orthorhombic, tabular habit, green, trans- parent, optically anisotropic. The structure of the isometric ...
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V O L U M E 28, NO. 7, J U L Y 1 9 5 6

1211

OPTICALPROPERTIES Refractive Indices (5893 A