OF THE ROCKS OF LAKE 



SUPERIOR. 



249 



485. Same as No. 484 ; but of a darker red colour. Contains patches of chlorite, 

 and irregular lumps of flesh-coloured felspar. 



486. Metamorphosed siliceous shale — colour, dark reddish brown; fracture, 

 uneven, shaly ; fine granular. Resembles the siliceous grits of the clink-stone type 

 on the north shore of Lake Superior. 



487. Same as No. 486. More highly metamorphosed ; colour, brownish red ; 

 fracture, smooth and even ; subporphyritic ; contains patches of chlorite. 



488. Gray oxide of copper, with earthy green carbonate. 



489. From a vein at Dr. Borup's mine — epidote and quartz. Some of the epi- 

 dote is crystallized, and some is massive. 



490. From a N. 5° E. dike — colour, purplish red ; very fine-grained; contains 

 streaks and patches of chlorite ; weathered surface, iron-shot ; great specific gravity. 



491. Greenstone (?) — colour, gray; numerous small green points, made by grains 

 of hornblende. This rock resembles the shaly greenstones of Kinechigakwag Creek, 

 and may possibly be a sandstone, metamorphosed by contact with a dike, which is 

 only twenty-five feet distant. 



492. Metamorphosed sandstone — colour, reddish gray ; crystalline. 



493. Syenitic granite — tolerably fine-grained ; felspar predominant, flesh-coloured. 



494. Gneiss — fine-grained ; colour, gray. 



495. Syenitic gneiss — with pale reddish felspar, and black mica; traversed by 

 granite veins. 



496. Coarse quartzose granite, in large veins. 



497. Syenite — colour, reddish, in consequence of flesh-coloured felspar predomi- 

 nating. 



498. Syenite — felspar, white ; hornblende predominates, giving a dark appearance 

 to the rock. 



499. Hornblende rock — a compact compound of quartz and hornblende, the 

 former predominating ; very fine-grained ; fracture uneven, inclining to splintery ; 

 colour, gray. 



500. 501. Quartzose veins in No. 499, with nodules and seams of hornblende and 

 iron pyrites. 



502. Hornblende rock — very compact; colour, gray; uneven fracture ; grains of 

 iron pyrites disseminated through the rock. 



503. Porphyritic syenite — flesh-coloured felspar, giving a reddish hue to the 

 rock ; quartz and hornblende equally divided ; irregular fracture ; felspar predomi- 

 nates. 



504. Syenitic granite — felspar predominant, and flesh-coloured; tolerably fine- 

 grained. 



505. Gneissoid rock — colour, dark gray ; graduates into mica slate. 



506. Slaty hornblende — fine-grained; colour, light green. 



507. Micaceous clay slate — very fine-grained; the mica thinly disseminated; 

 colour, grayish green. 



508. Siliceous slate — colour, gray ; very hard ; fracture, splintery; minute grains 

 of iron pyrites sparsely disseminated through it. 



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