THE SULPHATES. 



173 



TABLE 102. Uranyl potassium sulphate: Ki.UO^SOJz.SHzO. Fluorescence at -185 C. 



Prepared by crystallizing a solution of the two component salts in the proportions of the 

 double salt. The composition has been determined by Rimbach (Ber. d. d. Chem. Ges., 37, 478 

 (1904). The crystals obtained in this laboratory were orthorhombic. The preparation con- 

 sisted of 6-sided plates and rounded grains about 0.045 mm. in diameter, the plane of the optical 

 axis being a (100) and b the acute bisectrix. Double refraction positive. 



