OF THE ROCKS OF LAKE SUPERIOR. 265 
heavy dike, and, in all respects, is like that on the easterly side of Pigeon Bay, and 
marked No. 647. The weathered surface, however, is greenish gray, of a lighter 
colour than the fresh fracture. Both these rocks, probably, contain diallage. 
654. Greenstone—colour, dark gray, nearly black; the hornblende crystalline, 
the felspar white. 
655. Syenite—composed of fine crystalline grains of hornblende and red felspar ; 
but little quartz; contains iron pyrites. 
656. Metamorphosed clay slate, in contact with a dike—colour, dark gray; con- 
tains a few scales of mica; the planes of stratification and cleavage nearly oblite- 
rated ; stained with oxide of iron. 
657. Argillaceous slate—very thinly laminated ; colour, nearly black. 
658. Siliceous shale—in thin lamine ; colour, dark reddish black; somewhat 
metamorphosed. 
659. Very fine-grained basaltic-looking rock; somewhat schistose ; probably a 
metamorphosed rock. 
660. Greenstone—colour, dark greenish ; very fine-grained ; compact. 
661. Similar to No. 660, but with well-developed minute crystalline grains of 
hornblende. 
662. Hornblende rock—coarsely crystalline ; dark-coloured, the quartz being of 
a dirty greenish colour; graduates into syenite; the felspar predominating, and 
sometimes in large crystals. 
663. Like No. 661, but rather more crystalline ; fine-grained ; contains some iron 
pyrites. 
664. Greenstone—colour, gray; fine-grained ; compact; even fracture; contains 
small grains of reddish felspar. 
665, 666. Very fine-grained basaltic-looking rock—colour, greenish gray. May 
be called a greenstone. 
667. Syenite—flesh-coloured felspar predominating; porphyritic. A beautiful 
rock in the mass. 
668. Syenite—contains but little quartz or hornblende, being made up princi- 
pally of red felspar; passes gradually into regular greenstone. 
669. Quartzite—fine granular; colour, gray. A metamorphosed sandstone. 
670. Metamorphosed siliceous shale—very fine-grained ; colour, dark purplish ; 
very compact; fracture conchoidal ; somewhat impregnated with oxide of iron. 
671. Quartzite—colour, reddish gray ; fine-grained; in some places resembles 
syenite. A metamorphosed sandstone. 
672. Quartzite—colour, gray; fine-grained; sub-crystalline. A metamorphosed 
sandstone. 
673. Greenstone—crystalline ; compact; irregular fracture ; colour, dark greenish. 
674. Slaty greenstone—alternating with siliceous schist; colour, gray; contains 
grains of red felspar. ; 
675. Greenstone—highly and minutely crystalline; porphyritic; colour, from 
light to dark gray. 
676. Quartzite—fine-grained ; compact; colour, dark gray. A metamorphosed 
sandstone. 
34 
