287 



No distinct cleavability was observed. 



The pale green crystals are distinctly dichroitic : on {JOOj pale 

 yellowish-green for vibrations parallel to the c-axis , for those 

 perpendicnlar to them, pale green. The plane of the optical axes is 

 I 001 I, with the nt-axis as tirst bisectrix, probably of positive character. 

 The birefringence is weak ; the apparent axial angle is very small. 



RUBIDIUM-FERRI-MALONATE. 



Pale green, rhombical limited crystals. 



Rhombic-bipyrarnidal. 

 a:b:c = 0,9442 : 1 : 0,6985. 



Fig. 3. Rubidium-Ferri-Malonate. (+ 1 H^O). 



1) This content of water of crystallisation is adopted because of the isomorphism 

 with the other salts. The numbers of the analysis were unsatisfactory, the quantity 

 of material at hand being too small. 



