No. l.J HOFFMANN — RECENT ANALYSES. 55 



RECENT ANALYSES OP CANADIAN MINERALS 

 AND RIVER WATERS. 



From a recent Report by Mr. Chistian Hoffmann, F. Inst. Clicm. to 

 the Director of the Geological Survey. 



CYANITE. 



From the North Thompson River, British Columbia — Col- 

 lected by Alfred R. C. Selwyn, Esq. 



The mineral was imbedded in a granular quartz which, in 

 addition, contained a few scales of a silvery-white mica. It, for 

 the most part, occurred in in the form of radiated columnar 

 aggregates, the colour of which was in parts pure blue, passing 

 into greenish-grey ; occasionally, but rarely, almost colourless — the 

 other portions were of a uniform light bluish-grey colour. Lustre 

 vitreous. Subtraosparent. Specific gravity, 3.6005. 



The material selected for analysis was found, after drying at 

 100^ C, to have the following composition: 



Silica 36.288 



Alumina 62.254 



Ferric oxide 0.552 



Lime 1.064 



Magnesia 0.355 



100.513 



Previous to the finding of this specimen, cyanite was not known 

 to occur in Canada. 



LAZULITE. 



Found three-quarters of a mile east of the mouth of the 

 Churchill River, — District of Keewatin. Collected by Dr. R. 

 Bell. 



Occurs massive in veins, having a maximum width of seven 

 millimetres, traversing a greyish-white, in parts milk-white, sub- 

 translucent quartz. Colour fine deep azure-blue. Lustre vitreous^ 

 Fracture uneven. Brittle. Streak white. Subtranslucent.. 

 Hardness very nearly but not quite 5.5. Specific gravity — 

 3.0445. Before the blow- pipe colours the flame pale bluish-green,; 

 swells up, whitens and falls to pieces, but does not fuse. 



The material upon which the analysis was conducted, although 

 eelected with greit care, and apparently pure, was nevertheless 



