PYROSMALITE. 14-3 



Lustre resinous. Colour brownish-black; if decayed, 

 yellowish-brown. Streak brownish-black. Opake. 



Is scratched by rhombohedral Lime-haloide. Sp. Gr. 

 = 2*19, BERZELIUS. 



If gently heated on one side, it takes fire, and burns 

 without either flame or smoke; after which it becomes 

 white, and melts into a black enamel. It gives a transpa- 

 rent glass with borax, is soluble in heated acids with the 

 exception of a black powder, and consists, according to 

 BEBZELIUS, of 



Silica 10-43. 



Alumina 3-59. 



Protoxide of Cerium 13-92. 



Protoxide of Iron 6-08. 



Yttria 4-87. 



Lime 1-81. 



Protoxide of Manganese 1-39. 



Water 26-50. 



Carbon 31-41. 



It has been found at Ka'rarf near Fahlun in Sweden, in a 

 kind of granite, accompanied by prismatic Gadolinite. 



PYROSMALITE. 

 MICA. 



Pyrosmalite. JAM. Syst. Vol. III. p. 561. Man. p. 329. 

 Pyrosmalite. PHILL. p. 235. 



Ilhombohedral. Combination, R QD. R -f oo. 

 Cleavage, R oo perfect; R + x less distinct. 

 Fracture uneven. 



Lustre pearly upon R oo ; lower degrees of vi- 

 treous lustre in other directions. Colour pale 

 liver-brown, passing into grey and green. Streak 

 paler than the colour. Translucent ... opake. 



