I 



On Mttallic Minerals. 351 



Sidphitret of Iron, — 



rounds the blocks of limestone in this 



conglomerate. The hepatic variety 



partakes sometimes so nnich of the 



'iinnO general decomposition of the shale it is 



found in, as to have lost its metallic 



lustre and specific gravity. 



twin crystals of cubic iron pyrites have 



been observed disseminatetl through 



some of the clay slate in the district of 



Quebec. If one of two cubes of metal 



of the same dimensions, be cut in a 



particular manner, it is possible to put 



the other through it ; the aj)pearance 



of these twin crystals is similar to what 



would be observed in trvinsr this 



experiment. 



a large dL'|)osit associated with gypsum, 



on the Magdalen Islands. 



I'LUMBAGO. — CARBUllET OF IRON. — GRAPHITE. 

 CARBON, IRON. 



Car/juret of Iron, — in the towfiship of Houghborongh. 



at Hull on the Ottawa, mixed u[> with 



magnetie iron. 



disseminatiMl through several of the rocks 



between these two places, 

 on the chores of the Ganiumofpii, and in 



some other places, chiefly in the east- 

 ern section of the Upper I'rovince. 



in amygdaloid at I'oint Marmaise, Lako 

 Superior. 



Ihnvksbiiry on the Ottawa. 



Y 



