508 ANALYSES OF CANADIAN ItnNERALS, 



character of the deposits from which they were taken. Very probabty, hoTT- 

 ever, these deposits when opened out will be found to contain a larger percent- 

 age of intermixed carbonate of lime and siliceous matter than is shewn in the 

 above analyses. The samples were accompanied by others, labelled equally 

 "phosphate of lime," but which consisted of large greyish-green crystals of 

 pyroxene, much resembling apatite to an unpractised eye, but easily distin- 

 guished in most cases by their shape. In some, nevertheless, the prisms were 

 six-sided, or composed of the four ordinary pri&m-planes> with the two planes of 

 the front or ortho-pinatoid, the clino-pinakoid faces, so commonly present, being 

 either wanting or reduced to mere lines. One of these samples was marked 

 " Osso : Crow Lake." 



(3.) Iron Ore from the Township of Bedford. 



This sample consisted of black, strongly magnetic ore, sliewing 

 polarity, and presenting a cleavable structure. Sp. gr. = 5-05. The 

 average composition was as follows : 



Protoxide of Iron 26'93 



Sesquioxide of Iron 59"39 



Sesquioxide of Manganese trace only. 



Alumina O'Q'J 



Magnesia .... 0-82 



Lime 0-33 



Titanic Acid 3"23 



Phosphoric Acid trace only. 



Sulphur O'OY 



Silica and siliceous rock-matter , , 8'38 



99 82 



Metallic Iron = 6252 p.c. 

 Note. — Another sample of magnetic ore of a very similar character, also frona 

 Bedford, but said to have come from a different deposit, was found to contain 

 5.11 p, c. titanic acid, with 29.03 protoxide, and 56.52 sesquioxide. When 

 titanic acid is present, the amount of protoxide of iron seems to be always in 

 excess of the amount normally present iu the magnetic compound. The per- 

 centage of titanic acid does not appear to be always constant in the same 

 deposit. A sample of magnetic ore from South Crosby gave Dr. Sterry Hunt, 

 for example, 9.80 p. c, whilst another portion of this ore was found by Dr. 

 Hayes, of Boston, to hold no less than 16.45 p.c. Hence an ore containing 

 even a small proportion of titanium may be viewed with a certain amount of 

 suspicion as regards its ulterior yield. The presence of titanium does not, of 

 course, affect the quality of the reduced metal, as the whole of it, or essentially 

 all, goes into slag. But it affects the quality of the ore, and in three ways : 

 first, by taking the place of iron in the ore ; secondly, by rendering the ore, in 

 general, more refractory; and thirdly, by carrying off a certain amount of 

 metal in passing into slag. Where the amount of titanic acid in an. ore does not 

 exceed, however, 4 or 5 p. c, it is of no material consequence. 



