32 P. T. Cleve, 



The molybdate of samarium, Sm2 3Mo04, formed small rhombic 

 octahedrons and combinations of the horizontal and vertical prisms. 

 Some crystals attained a length of '/4 — Vio ^^ ^ millimetre. They had a 

 diamond-lustre and a dark violet colour, occasioned by a trace of mo- 

 lybdic oxide. Heated in the air they became white. They were very 

 slowly decomposed by hydrochloric acid. The spec. grav. was 5.95, 

 but this number is only approximate as the salt was not pure. The 

 analysis gave 47.4 percent SmjOa instead of 44.62 percent. 



Molybdate of samarium and sodium 



SmNa2Mo04. 



As described above, thin microscopic needles of this salt were 

 obtained along with the neutral molybdate of samarium, by fusing mo- 

 lybdic acid and oxide of samarium with chloride of sodium. Separated 

 from the neutral salt by elutriation, it formed a voluminous wolly mass 

 of a dirty violet colour, which colour disappeared on gently heating in 

 the air. Warm dilute hydrochloric acid dissolves this salt easily. 



0.4402 gram gave O.1518 SmjOg and 0.0597 gram NaCl. 



100.00 493 100.00 



Spec. Grav. = 5.265 at 18'^ as mean of two determinations. As 

 the salt was not perfectly pure, this number may be regarded as only 

 an approximation. 



Tungstate of samarium and sodium 



Sm.Na.gWO^. 



Was obtained by Mr Hôgbom'), who heated tungstic acid with a 

 corresponding quantity of the oxide of samarium in an excess of chlo- 

 ride of sodium. The salt forms brown microscopical crystals. The 

 analysis gave: 



') Bull. Soc. Cliim., T. XLII, 5. Ôfvers. af K. Sv. Vet. Akad. Förh. 1884 

 N:o 5, p. 120. 



