OF CENTRAL CANADA PART II. 83 



30. Titaniferous Iron Ore (Ilmenite, Menaccanite in part) : 

 Iron-black ; streak-powder, brownish-black to chocolate-brown. 

 Hemi-Hexagonal, but commonly in lamellar and granular masses. 

 When pure, not magnetic ; but sometimes feebly-magnetic, probably 

 from intermixed magnetic iron ore. H=5-6; sp. gr. 4.3-5.0. 

 BB, like Herrnatite ; but the glass formed with phosphor- salt, after 

 exposure to a reducing flame, has a distinctly red colour. Composi- 

 tion, essentially iron, titanium, and oxygen, in variable proportions. 

 The Titaniferous ore from Baie St. Paul, on the Lower St. Law- 

 rence, as deduced from Dr. Sterry Hunt's analysis, contains 

 Titanium 29.63, Iron 36.11, Oxygen 29.10, in addition to 3.60 per 

 cent, of magnesia. * 



This ore occurs in Canada, in vast beds or masses interstratified 

 with feldspathic rocks of the so-called Labrador or Upper Laurentian 

 Series, at Baie St. Paul, below Quebec. At this locality, it exhibits 

 a peculiar structure : an aggregation of coarse granular concretions 

 composed of irregular lamellae. Small grains of rutile are scattered 

 in places through the mass. The principal bed is ninety feet in 

 thickness and of great extent, but the ore at present is comparatively 

 useless. This substance occurs also in grains and thin bands in a 

 similar anorthosite or feldspathic rock (eee Part III) in the neigh- 

 bouring parish of Chateau Richer, and likewise under the same 

 conditions in the Township of Rawdon, in Montcalm County. It 

 has been detected also by the officers of the Geological Survey, 

 amongst the iron ores of the metainorphic strata of the Eastern 

 Townships : as in St. Francis, in Beauce County, and in Brome and 

 Sutton. 



(2) MAGNHTITK GROUP OF IRON OXIDES. 



31. Magnetic Iron Ore or Magnetite: Iron-black, with black 

 streak, and in general a sub-metallic lustre. Strongly magnetic,, 

 most specimens exhibiting polarity (see under Magnetism, Part I). 

 Regular in crystallization, and often 



found in octahedrous and rhombic 

 dodecahedrous (Figs. 45 and 46), the 

 faces of the latter commonly striated 

 parallel with the position of the edges 

 of a plane of the octahedron. Occurs 

 also still more frequently in lamellar, 

 granular, and other masses, sometimes forming large beds or 



