252 DESCRIPTIVE CATALOGUE 



569. Greenstone — fine-grained; but breaking with a rough, almost hackly frac- 

 ture ; colour, light green. 



570. Greenstone — coarsely granular ; colour, grayish green; irregular fracture; 

 in some places porphyritic. 



571. Syenitic rock — resembling hypersthene; coarsely granular; subporphyritic ; 

 irregular fracture ; fresh fracture, greenish-coloured ; weathered surface, brownish 

 black ; grains of iron pyrites sparsely disseminated through it. 



572. Syenite — felspar largely predominating ; light-coloured ; hornblende in small 

 crystals. Resembles syenite from the Simplon, in the Alps. 



573. Syenitic granite — a coarse-looking gray rock, with white felspar, which is 

 subordinate to the hornblende. 



574. Hornblende rock — composed of quartz and hornblende ; colour, nearly black, 

 from the great preponderance of crystalline hornblende. 



575. Quartzose gneiss — dark-coloured; stained with numerous ferruginous 

 blotches. 



57G. Granite — felspar predominant, and of a pale flesh-colour; mica, black; 

 deeply stained with oxide of iron. 



577. From a granite vein in No. 575 — contains but little mica; the felspar 

 largely predominating, and of a pale flesh-colour. Appears to be the same rock as 

 No. 576. 



578. Same as No. 574, but more nearly resembling greenstone. 



579. Granite — rather coarse-grained ; dark-coloured ; composed of minute crystals 

 of hornblende, quartz, black mica, and flesh-coloured felspar. 



581. Resembles No. 574 — finely crystalline; the quartz predominates, however, 

 and gives the rock a gray colour. 



582. Syenite — colour, grayish; composed of extremely small grains of horn- 

 blende, quartz, and felspar. 



583. Quartz and flesh-coloured felspar, the felspar predominating; coarse-grained. 



584. Granite — fine-grained; highly crystalline; the felspar red, and the mica 

 black. 



585. Altered sandstone, approaching to quartzite ; colour, red. 



586. Quartzite — a highly metamorphosed sandstone ; colour, purplish red. 



587. Limestone — containing a Murchisonia of the Silurian type. 



588. Bears N. 30° E. Very fine-grained — almost homogeneous. Colour, dark 

 gray ; jointed. The joints present a polished, shining, black surface, with, in some 

 cases, the lustre of crystallized hornblende, and have a greasy feel. It may be 

 called basaltiform greenstone. This is the first rock at the Entry Point. Between 

 many of the joints, the surface is iron-shot. Magnetic. 



589. Bears N. 45° E. Greenstone. Colour, greenish gray. Crystalline. Wea- 

 thers with an even surface ; contains small grains and crystals of yellow iron pyrites. 

 The felspar white and greenish-coloured. Weathered surface lighter-coloured than 

 a fresh fracture. 



590. This rock, which is in contact with the trap rocks, and might be classed 

 among the syenites, is, undoubtedly, a metamorphosed one ; and was derived, pro- 

 bably, from the siliceo-argillaceous beds found between the Entry Point and Fond 



