1877.J 



517 



[KOnig. 



Specific gravity = 3.433 at 13 0° (witli coarse powder)- Before the 

 bloicpipe melts easily to a black glass in the flame of oil lamp. With micro- 

 cosmic salt gives the reaction of silica, iron, manganese, and with difficulty 

 that of titanium. Colors the flame yellow. Imperfectly decomposed by 

 fusion with K H S O^, not acted upon by hydrochloric and sulphuric acid 

 at atmospheric pressure, and very slowly decomposed with sulphuric acid 

 in a sealed tube at 160 Co. 



27.164 



4.764 



6.928 



5.702 



1.000 



1.454 



97.97 



R : ]^ : R 



17 



4.3 



To obtain the atomic ratio, we have 



and the nearest symbol will be 



IV 



Sis 

 // vr 

 Fe, Fe Na, 



O 



21 



It is apparent that neither the oxygen ratio, nor the atomic ratio lead to 

 a very satisfactory formula, in as much as the formula given contains one- 

 half atom of oxygen more than required to satisfy the affinities of the 

 metals. 



PROC. AMER. PHILOS. SOC. XVI. 99. Sm 



