OF CENTRAL CANADA PART II. 57 



stance, by consulting in the first instance the annexed simplified Key, 

 in which Canadian minerals of common occurrence ape alone included. 

 Reference should then be made, for confirmatory proofs, to the com- 

 plete description of the species indicated by the Key. 



A TABULAR GROUPING OF CANADIAN MINERALS OF COMPARA- 

 TIVELY FREQUENT OCCURRENCE. 



* Aspect Metallic or Sub- Metallic. 



** Hard enough to scratch glass distinctly. Not scratched, or very slightly- 

 scratched, by the point of a knife. (Streak distinctly coloured.) 



(a) Pale brass-yellow (Often in cubes) -.Iron Pyrites (No. 20). 



(b) Tin-white, or between silver-white and pale -grey (Emitting a garlic- 



like odour on ignition) : Arsenical Pyrites (No. 22). 



(c) Steel-grey ; powder, dull-red: Specular Iron Ore (No. 29). 



(d) Iron-black ; powder, black ; strongly magnetic : Magnetic Iron 



Ore (No. 31) 



(e ) Iron-black ; powder, black or brown ; feebly or non-magnetic : 



Titaniferous Iron Ore (No. 30) : also Chromic Iron Ore (No^ 33). 



*** Too soft to scratch glass. Easily scratched by a knife-point. 



(a] Colour, yellow : A ative Gold (No. 3). 



(b) Colour, silver-white (but often with dark tarnish) ; Native 



Silver. 



L(c) Colour, black -.Silver Glance (No. 11). 



( (d) Brownish-yellow ; slightly magnetic : Magnetic Pyrites (No. 19. } 

 (e) Brass-yellow (often with varigated tarnish) ; streak, greenish 



black -.Copper Pyrites (No. 16.) 

 (/) Reddish, with purple tarnish ; streak, greyish-black : Purple 



Copper Pyrites (No. 15.) 



| (g) Dark-grey (ofthe with blue or green tarnish) ; cleavage indis- 

 tinct : Copper Glance (No. 14.) 



j (h) Lead-grey ; breaking readily, with rectangular cleavage, into 

 j cubical fragments ; very heavy : Galena (No. 12.) 



(i) Light lead -grey ; in soft scaly masses ; marking : Molybdenite 



(No. 23.) 

 (k) Black ; soft, mostly in scaly or leafy masses ; marking and 



soiling, Graphite (No. 1.) 



(I) Lustre, metallic-pearly : brown, black, silvery- white, &c. In 

 foliated or scaly masses with white or light streak ; easily 

 separated into thin leaves : Mica, including chiefly Musco- 

 { vite (No. 77) and Phlogopite (No. 78.) 



t Aspect : vitreous, stony, or earthy. 



tt Hard enough to scratch glass distinctly. Not scratched by a knife-point. 



(a) Vitreous : colourless, amethystine, brownish, &c. Mostly in hex- 



agonal prism-pyramids, or in groups of sharply-pointed crystals; 

 otherwise massive. No lamellar structure. (Infusible): Crys- 

 talline Quartz, including Rock Crystal, Amethyst, Smoky Quartz, 

 &c. (No. 43). 



(b) Vitreous or stony. In nodular masses of grey, red, bluish, and 



other colours, two or more tints being often present together 



