22b' Canadian Record of Science. 



On Canadian Spessartite and Mountain Cork 



By B. J. Harrington, McGill College. 



Read before the Natural History Society, March 31st, 1890. 



1. — Spessartite. 



The Villeneuve iMica Mine, on the thirtieth lot of Eange 

 1, Yilleneuve, Ottawa County, P.Q., is already known to 

 many on account of the interesting minerals which it has 

 afforded. The vein, which was at one time worked for 

 mica, is a coarse granite, traversing grey garnetiferous 

 gneiss, and consisting of quartz, muscovite, orthoclase 

 and albite, with occasionally black tourmaline and garnet 

 It has also yielded the rare minerals uraninite and mo- 

 nazite. 1 The garnet occurs imbedded in both the feldspar 

 and the muscovite, and crystals of that found in the latter 

 have recently been analysed by the writer. The crystals 

 are much distorted and more or less flattened in the direc- 

 tion of the cleavage planes of the mica. They range, in the 

 few specimens examined, from one up to about ten mm. in 

 greatest diameter, and are of a beautiful red colour. They 

 are rather brittle, but possibly some might be obtained which 

 would stand being cut as gems. The specific gravity was 

 found to be4 - 117 and analysis of carefully selected material 

 gave the following percentage composition : — 



Silica 36-30 



Alumina 19*20 



Ferrous Oxide 10 ■ 66 



Manganous Oxide 30 • 06 



Lime 3-07 



Magnesia 0-43 



Loss on ignition 0.31 



100.03 



1 G. C. Hoffmann, Ann. Eep. GeoL Can. 1886, p. 11 T., and F. A. 

 Genth, Am. Jour. Sci., 1889, p. 203. 



