0 F T HE HOCKS OF LAKE SUPERIO R. 



239 



321. Metamorphosed argillaceous shale — of a dirty black colour, with numerous 

 dark green spots, probably chlorite ; slightly amygdaloidal. Contains pebbles of 

 other rock. 



322. Metamorphosed volcanic grit, or sand-rock — colour, reddish gray ; rough 

 granular fracture ; amygdaloidal, the cells filled with round grains of thalite, of a 

 nearly white colour ; very ferruginous. 



323. Volcanic grit — very amygdaloidal; the cells filled with zeolites; colour, 

 light gray, with a reddish tint. Presents, in the mass, a curious mottled appearance. 



324. Volcanic grit — more compact than No. 323, but still amygdaloidal ; colour, 

 dark grayish red ; contains grains of thalite. 



325. Volcanic grit — hard; compact; slightly amygdaloidal ; colour, red; contains 

 grains of thalite. 



326. Very coarsely crystalline greenstone — the hornblende predominating ; colour, 

 black. 



327. Greenstone — similar to No. 326. 



328. Anorthite rock — colour, greenish gray, gray, grayish pink, pink, flesh-red, 

 sea-green ; some of the crystals olive-green. Massive ; highly crystalline ; fracture, 

 uneven, lumpy, jagged, smooth. Resembles quartz in its general aspect, and might 

 be mistaken for it on a superficial examination. Lustre vitreous ; transparent, 

 translucent, subtranslucent, to opaque ; streak, white ; lustre of some of the crystals 

 inclining to pearly. In the forceps, fuses easily to a transparent glassy bead, full 

 of blebs. Weathers with a smooth whitish or gray surface, and without forming 

 an incrustation. 



329. Greenstone — same as No. 327. 



330. Greenstone — colour, dark gray ; finely crystalline ; fracture uneven ; weathers 

 with an iron-shot crust. 



331. This rock resembles syenite in general appearance, but is composed of 

 Labrador hornblende and white felspar, with a great deal of stilbite disseminated 

 through it, in small aggregations and crystals. The red stilbite, the black horn- 

 blende, which is beautifully iridescent, and the white felspar, each being in separate 

 aggregations, combine to form an extraordinarily beautiful rock. 



332. From a vein. Contains prehnite, calcareous spar, laumonite, quartz, and 

 earthy green carbonate of copper. 



333. Greenstone — highly crystalline; colour, dark gray; felspar, white and 

 yellowish white. 



334. Metamorphosed siliceo-argillaceous shale — colour, dark purplish red, with 

 occasional dark green spots and stripes, probably due to chlorite ; very fine-grained ; 

 hard ; fracture, irregular, and somewhat splintery. Resembles one of the meta- 

 morphosed beds of Kinechigakwag Creek. 



335. Siliceous schist — very quartzose ; colour, gray, with a greenish tinge ; meta- 

 morphosed ; resembles some of the slaty greenstones in general appearance. 



336. Greenstone porphyry — reddish-coloured crystals of felspar, embedded in a 

 greenish-coloured paste of light-coloured felspar and hornblende. 



337. Greenstone. 



