Hoffmann — New mineral occurrences in Canada. 149 



Art. XI. — On some new mineral occurrences in Canada ; 

 by G-. Chb. Hoffmann, of the Geological Survey of Canada. 



[Communicated by permission of the Director.] 



1. Lepidolite. 

 This species has been found to be a constituent of a coarse 

 granite vein, of very considerable width, on the twenty- 

 fifth lot of the seventh range of the township of Wakefield, 

 Ottawa County, in the province of Quebec. The minerals 

 composing this vein consist of white and light smoky-brown 

 to brownish-black quartz, pinkish and light to dark verdigris- 

 green microcline, a grayish albite having a fine bluish opales- 

 cence, and the mica in question, together with some aggrega- 

 tions of light purplish crystals of fluorite, and fine crystals of 

 black and green tourmaline. The mica occurs in broad folia- 

 tions having a rough, distorted hexagonal contour, and which 

 in some instances have been found to measure fourteen by 

 twenty-eight inches or more across. It has a pearly luster. 

 In thin laminse it is transparent and colorless ; in combinations 

 of several laminse it exhibits, on a white surface, a fine, light 

 purplish color ; and in layers of about half an inch in thick- 

 ness it has, by reflected light, a rich purplish brown color. 

 Before the blowpipe, it fuses easily and with much intumes- 

 cence to a light yellowish-brown glass, simultaneously color- 

 ing the flame intense carmine-red. Its specific gravity, em- 

 ploying the air-pump, at 15-5° C, was found by Mr. K. A. A. 

 Johnston to be 2*858, and its analysis afforded him the follow- 

 ing results : 



Silica 47*89 



Alumina 21*16 



Ferric oxide . 2*52 



Manganous oxide 4*19 



Potassa . . . 10*73 



Lithia 5 -44 



Soda 1-34 



Magnesia. 0-36 



Water (direct estimation) 1*90 



Fluorine 7 -41 



102-94 

 Less oxygen, equivalent to fluorine 3-12 



99-82 



2. Newoeryite and Struvite. 

 A material corresponding in composition to a mixture 

 of these two minerals has recently been obtained from part- 



