[507] 

 ANALYSES OF CANADIAN MINERALS. 



BY E. J. CHAPMAN, Ph.D., 



Professor of Mineralogy and Geology in University College, Toronto. 



The following analyses of some of our commercial oi'es and econo- 

 mic minerals were made recently in tlie assay-office of the writer. It 

 is proposed to publish in the Journal, from time to time, additional 

 analyses of similar character. 



(1.) Sample of Fluor-Apatite from the Township of Bed- 

 ford (Lot 2, Con. xii). 



This sample, of about 2 lbs. in weight, shewed throughout its mass 

 a well-marked lamellar structure and pale apple-green colour. Sp. , 

 gr. = 3"18. Average composition : 



Phosphate of Lime 88-32 



Fluoride of Calcium '7"12 



Chloride of Calcium .' 0'53 



Carbonate of Lime (intermixed) 2'33 



Sesquioxide of Iron traces. 



Silica 1-5Y 



99-87 

 (2.) Sample of Fluor-Apatite from South Crosby (Lot 13, 



Con. vi). 



A lamellar apatite of a mixed reddish and pale-green colour. Sp. 



gr. = 3"16. Average composition : 



Phosphate of Lime 87'92 



Fluoride of Calcium 7-08 



Chloride of Calcium 0'57 



Carbonate of Lime (intermixed) 1'26 



Sesquioxide of Iron 0*27 



Silica 2-72 



99-82 

 Note. — In these commercial analyses, after separation of the intermixed 

 carbonate of lime and the siliceous rock matter, the lime, phosphoric acid, and 

 chlorine were determined directly, and the fluorine was calculated from the 

 amount of lime in excess of that required by the phosphate and chloride. 

 When the crushed mineral is warmed with sulphuric acid, the evolved fumes 

 exert a strongly-marked corrosive action on glass. The samples analysed were 

 not obtained personally, but thej were said to represent fau'ly the general 



