CHEMICAL CONTRIBUTIONS 



TO THE 



GEOLOGY OF CANADA, 



FROM THE 



LABORATORY OF THE SURVEY. 



BY 



CHRISTIAN HOFFMANN, F. Inst. Chem. 



MISCELLANEOUS MINERALS. 



CYANITE. 



From the North Thompson River, British Columbia. — Collected 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 rarel} T , almost colourless — the other portions were of a uniform 

 light bluish-grey colour. Lustre vitreous. Subtransparent, Specific 

 gravity, 3.6005. 



The materialselected for analysis was found, after drying at 100° O, of Cyanite. 

 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. 



