22 PHYSIOGRAPHY. 



Magnetic Iron Magnetic Iron-Pyrites. 



greenstone, and sometimes in limestone. It is attended by Hornblende, 

 Epidote, Pyroxene and Garnet. 



4. Immense masses of this ore exist at Arendal in Norway, the Taberg 

 in Smaland, in Sweden, and Chili. It occurs also in Saxony, Bohemia 

 and the Hartz. It is met with in Corsica, in Unst, (one of the Shet- 

 land Isles,) in Russia and Siberia. It is also extremely abundant in the 

 U. States. The most interesting crystallized varieties are found atMun- 

 roe, (N.Y,) lining the sides of veins in the massive ore ; atMarlborough, 

 (Vt.) imbedded in chlorite ; and at Bridgewater, (Vt.) in chlorite .slate ; 

 also at Franconia, (N.H.) imbedded in Epidote and Quartz. Immense 

 beds of this ore exist in the gneiss, at different places upon the western 

 side of Lake Champlain ; also in the Highlands of New York, and in the 

 mountainous districts of New Jersey and Pennsylvania. 



5. It is one of the most important ores of iron, in furnishing the metal- 

 lic iron of commerce. 



MAGNETIC IRON-PYRITES. Rhomb. ohedral 



Bronze-Pyrites. 

 Primary form. Regular hexagonal prism. 

 Secondary form. 



Fig. 285. 



M on M' 

 M on d 

 P on a 

 P on c 



120 OCT 



150 00 



135 00 



102 13 



BOURNON. 



Cleavage, parallel with P perfect ; less so with planes 

 M. Fracture small, and imperfectly conchoidal. Surface 

 rough, particularly M ; sometimes also horizontally streak- 

 ed. Subject to tarnish. 



