MINERALS AND GEOLOGY OF CANADA. 173 
pyrites, &c., in our azoic and metamorphic rocks more especially, at 
various localities: as at the Lake Huron Mines; in Clarendon Town- 
ship (Pontiac Co.) ; in the Chaudiere Valley, &e. It sometimes con- 
tains a little cobalt, in which case, after exposure before the blow-pipe 
to drive off the greater part of the arsenic and sulphur, it fuses with 
with borax into a rich blue glass. 
The common cobalt ores (Smaltine and Cobaltine) belong also to this Section, 
but they have not yet been discovered in Canada, 
A 4. Colour, Steel-grey, Iron-black, or Brown. (No fumes before 
the Blow-pipe.) ‘ 
[Principal Minerals.—Streak, dull-red: Specular Iron Ore. Strongly magnetic; 
streak, black: Magnetic Iron Ore. Yielding water in the bulb-tube; streak, 
yellowish-brown; Brown Iron Ore.] 
Specular Iran, or Red Iron Ore.—Dark steel-grey, often inclining 
to blueish red. Streak, dull-red, the same as the colour of the earthy 
varieties described in Section D3. In rhombohedral crystals and 
crystallme groups, and in lamellar, micaceous, and fibrous-botryoidal 
masses, the latter often called Red Hematite. H. 5.5-6.5; 
sp. gr. 4.3-5.3. In thin splinters, fusible on the edges (although 
commonly said to be infusible.) Becomes also magnetic after expo- 
sure to the blow-pipe, and is often feebly magnetic in its normal con- 
dition, One hundred parts contain: Oxygen, 30; Iron, 70. This 
mineral is one of the most valuable of the Iron Ores. In Canada, it 
is exceedingly abundant, more especially in our Laurentian rocks, al-. 
though less so than the Magnetic Iron Ore. It occurs chiefly in these 
rocks in the Township of MacNab, on the Ottawa, where it consti-. 
tutes a vast bed, twenty-five feet thick, in crystalline limestone; and 
also associated with crystalline limestone at Iron Island, Lake Nipis- 
sing (Mr. Murray.) In the Huronian rocks, it is found at the 
Wallace Mine, Lake Huron; and it occurs likewise in metamorphic 
chloritic schists (altered Silurian shales of the age of the Hudson 
River group), associated with magnetic iron ore, dolomite, &c., in the 
Eastern Townships of Sutton, Bolton, and Brome. 
Iimenite.—This substance, (normally, perhaps, a compound of the 
sesqui-oxides of titanium and iron,) has an iron-black or dark steel- 
grey colour, with black or dark reddish-brown streak. It closely re- 
sembles and passes into Specular Iron Ore. At Baie St. Paul, C.E., 
a large deposit of Ilmenite, three hundred feet in length and ninety feet 
broad, occurs in a feldspathic rock of the Laurentian series. It is 
Vor. oO 
