MINERALS AND GEOLOGY OF CANADA. 151 
becomes magnetic after ignition. For’ more complete description, 
see A. 4, (Vol. V. p. 175.) 
Yellow Ochre (An earthy variety of Brown Iron Ore) :—In amor- 
phous and earthy masses of a dull yellow colour and streak. Leaves 
a yellow trace on paper; gives off water in the bulb-tube, and 
becomes magnetic after ignition. Localities and uses, the same as 
those of Red Ochre, described above. Of the two ochres, however, 
the present is by far the more abundant, and is the principal basis 
of the pigments manufactured at Point-du-Lac, in St. Maurice 
County. Quite recently it has been found, in some abundance, in 
the County of Middlesex, C. W. 
Humboltine, (Oxalate of Iron):—In yellowish crusts or thin 
layers in the bituminous shales (Devonian) of Kettle Point, Lake 
Huron, and the township of Inniskillen, Canada West. Streka, 
pale yellow or greyish. Turns black and red before the blow-pipe, 
and becomes magnetic. Yields about 16 per cent. of water in the 
bulb-tube. 
Uran-Ochre, (Hydrated Oxide of Uranium) :—In small earthy 
masses of a yellow colour, accompanying actynolite in the magnetic 
iron-ore of Madoc, C. W. Blackens-before the blow-pipe, but does 
not fuse. 
Vivianite or Phosphate of Iron:—In blue pulverulent masses, 
associated with bog iron ore in Vaudreuil County, on the St. Law- 
_ rence and Ottawa, C. E. Composition: phosphoric acid, protoxide 
of iron, and about 28 per cent. of water. 
Malachite or Green Carbonate of Copper:—Chiefly in green 
masses of a fibrous or lamellar structure, sometimes with botryoidal 
surface and banded shades of colour. Otherwise, in earthy coatings 
on copper ores, &c. Streak, pale green. H. 3°5—4:0 (or less) ; 
sp. gr. 3°7—40. Yields water in the bulb-tube, and becomes 
reduced per se to metallic copper before the blow-pipe, tinging 
the flame green. Composition: carbonic acid, 20; oxide of copper, 
72; water 8—the latter, however, usually somewhat higher. Mala- 
chite occurs in small quantities, with native silver, &c., in quartz 
and cale-spar at Prince’s Mine, Spar Island, Lake Superior: Also 
occasionally, as an incrustation, amongst the copper ores of Lake 
Huron and those of the Eastern Townships. The blue carbonate, 
in an earthy state, is sometimes mixed with it. 
