132 PHYSIOGRAPHY. 



Pyrosmalite Pyroxene. 



3. It has been found at Kararf, near Fahlun in Sweden, in a variety 

 of granite, accompanied by Gadolinite. 



PYROSIDERITE. (See Limonite.) 



PYROSMALITE. Hexagonal Pyrosmalite- 

 Mica. BREITHAUPT. 



Primary form. Regular hexagonal prism. 



Cleavage, parallel with the bases of the primary form, 

 perfect. Fracture uneven. 



Lustre pearly upon the bases of the six-sided prism ; 

 lower degrees of vitreous lustre in other directions. Color 

 pale liver-brown, passing into grey and green. Streak paler 

 than the color. Translucent . . . opake. 



Rather brittle. Hardness = 4*0 . . . 4*5. Sp. gr. = 

 3-077 . . .3-173. 



1. Before the blowpipe, it becomes reddish brown, and developes 

 fumes of muriatic acid. In a strong fire, it melts first into a black sco- 

 ria, and then into a globule, which is attractable by the magnet. It is 

 easily soluble in glass of borax. 



2. Analysis. 



By HISINGER. 



Silica . . . . . . 35850 



Protoxide of iron 21-810 



Protoxide of manganese . . . . 21-140 



Muriate of iron, with excess of base . . 14 095 



Lime 1-210 



Water ........ 5-895 



3. It occurs in the iron mines of Nordmark, in Wermeland in Sweden, 

 associated with Calcareous Spar and Pyroxene. 



PYROXENE. Paratomous Augite-Spar. MOHS. 

 Primary form. Oblique rhombic prism. M on M = 

 87 5'. (87 42'.) 



