THE CANADIAN JOUENAL. 



NE^V SERIES 



No. LXX. — NOVEMBER, 1869. 



ANALYSES OF SOME CANADIAN MINERALS. 



BY E. J. CHAPMAN, PH. D. 



PEOFESSOR OF MINERAIOGT AND GEOLOGY IN UNIVEESITT COIXEGE, TOEONTO. 



1. Graphite : from the township of Buckingham, on the Ottawa, 

 (lot 19, range 5). 



The sample employed in this analysis was apparently very pure : 

 soft, black, sub-foliated, and highly lustrous. Sp. gr. = 2-265. The 

 moisture was determined by desiccation in an air-bath at a temperature 

 of 212°. The carbon was then burnt off by prolonged ignition in the 

 muffle of an assay-furnace; and the- resulting ash was fused with car- 

 bonate of soda in a platinum vessel, and decomposed in the usual way 

 by chlorhydrie acid. 6-314 grammes lost 82 milligrammes by com- 

 plete desiccation, and left 1-1731 gramme of very faintly coloured ash 

 after exposure to long continued ignition. The analysis thus yielded : 



Carbon 80-12 



f Silica 12-86 



I Alumina 4-33 



EeO(fromFe2 03)... 1-07 



Lime 0-14 



Magnesia trace 



I^Loss 0-18 



Moisture 1-30 



Another sample (sp. gr. = 2-272) yielded : moisture 1-14, ash 22-06, 

 carbon (by difference, as before) 76-80. The composition of the ash 

 was not determined. 

 1 



Ash 18-58 { 



