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Notes 1463 ing orthorhombic symmetry. The mean refractive index is 1.85 ± 0.03, in agreement with the value 1.85 calculated as above. The differences in the optical properties suggest that this compound may not be isomorphic with the isoformular rubidium compound.Cs3PuCl6.-This compound melts congruently at 825 ± 3°a nd, on cooling, undergoes polymorphic transformation at 410°. Crystals of the roomtemperature modification are green in bulk by reflected light but, immersed in liquid of similar refractive index, are transparent and virtually colorless by transmitted light. They are optically anisotropic and exhibit very fine, complex, polysynthetic twinning. The mean refractive index is around 1.7, in agreement with the value 1.73 calculated as above. Discussion It is interesting to note the similarity between PuCl3 and UC135•6 in the formation of double salts with alkali chlorides. No compounds occur in the binary systems involving LiCl or NaCl.