OF CENTRAL CANADA PART II. 115 



abundant in all the phosphate deposits of the Ottawa region. Large 

 plates of economic value for stove-fronts, lanterns, <fcc., are obtained 

 in the townships of Grenville, Buckingham, Templeton, &c., and in 

 North and South Burgess. On the north shore of Rideau Lake in 

 Burgess, large six-sided plates and prisms, associated with apatite 

 and calcite, occur in great profusion. Translucent greenish-yellow 

 prisms with calcite and diopside occur also at Calumet Falls. 



Note : Lepidolite or Lithia Mica has not yet been recognized in 

 Canada, although abundant in Maine and in Connecticut. It is 

 mostly in granular scaly masses of a pink, red, or greyish colour, 

 melting easily and with much intumescence before the blow-pipe, and 

 colouring the flame carmine-red. Biotite is another magnesian mica, 

 closely related to Phlogopite, described above, but Hexagonal in 

 crystallization, and mostly black or green in colour. It is of doubt- 

 ful occurrence in Canada, but a dark-green mica from Moor's Slide 

 on the Ottawa has been referred to this species. 



79. Seybertite (Clintonite) : Brown, brownish-red. Mostly in 

 small scaly or foliated masses with peaT'ly-metallic aspect. H = 4.0 

 or less ; sp. gr. 3.0-3.1. BB, whitens but does not fuse, or melts 

 only on the thinest edges. Gives off water in the bulb-tube. De- 

 composed, in powder, by sulphuric acid. Contains a comparatively 

 small amount of silica. Average composition : silica 20, alumina 

 40, iron oxide 4, magnesia 20, lime 13, water 3. Occurs sparingly 

 in crystalline limestone with blue spinel in the seignory of Daille- 

 bout, Joliette County, Province of Quebec. 



80. Chlorite (Pennine) : Dark-green, greenish-grey. Hexagonal 

 or Hemi- Hexagonal in crystallization, but occurring principally in 

 scaly or foliated masses, and frequently in a more or less earthy 

 condition, or in granular slaty masses. H = 2.5 or less; sp. gr. 2.6 



- 2.8. Sectile. Flexible in thin pieces, but not elastic. BB, gen- 

 erally melts upon the edges. In the bulb-tube yields water. De- 

 composed, in powder, by hot sulphuric acid. Average composition : 

 silica 33, alumina 13, iron and chromium oxides 6, magnesia 35, 

 water 13. Occurs chiefly in crystalline strata south of the St. Law- 

 rence, forming beds of chloritic slates which often carry copper ores, 

 as in Cleveland, Bolton, Shefford, Melbourne, Ascot, and other 

 Eastern Townships. In Sutton, St. Armand, Brome, and elsewhere 

 in the same district, it occurs in admixture with specular iron ore, 



