OF THE ROCKS OF LAKE SUPERIOR. 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. Voleanic 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. 525, 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. 526. 
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. a 
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. 
