” 
A Last of Minerals and Organic Remains. 75 
Copper Pyrites—occurs in amorphous masses in various 
parts of Lake Huron. It is disseminated in gneiss on the 
north east coast, and imbedded in a veinof quartz travers- 
ing greenstone at the foot of the narrows of Pelletau inthe . 
north west of that lake. In Lake Superior, itis not uncom- 
mon, (but always in small quantity) in the druses of preh- 
nite, Zeolite and calc. spar so common in the amygdaloid of 
the north shore. Point Perquaquia, on the north side of 
Michipicoton Bay, has long been celebrated for its copper. 
was there in the summer of 1823, for a few minutes, but 
could only discover yellow and green coatings on a large 
vein of quartz in greenstone, with copper pyrites sparingly 
interspersed. 
Iron Pyrites.—-I have an octohedral crystal of this ore 
nearly two inches in diameter, from the township of Yonge, 
U.C. Iwas there shown a vein of iron pyrites 1: feet 
thick, of parallel sides, and visible for abouta yard. It is 
in primitive quartz, at the bottom of a round cavity about 
12 feet in diameter, in a mound of quartz, evidently the ef 
fect of an explosion. It is in the woods half a mile north 
from the high road from Montreal to Kingston, and 10 miles 
above Brockville. The sides of the cavity are studded 
with iron pyrites, and profusely invested by a yellow and 
white efflorescence, and by acicular crystals of what I bave 
only ascertained to be an aluminous salt, but of what pre- 
cise kind I cannot say. Fifteen years ago a man was seek- 
ing some stray cattle in this neighborhood, and on a sudden 
heard a loud explosion. Having approached the spot, he 
found it enveloped in a sulphureous smoke, which soon 
passing away disclosed the appearances above described.* 
Tron Sand.—Granular ; in great quantities at Batiscan in 
wer Canada. ag 
Magnetic Oxide of Iron.—The compact, or rather the 
fine granular form, often contaminated with sulphur abounds 
in the primitive region about the Crow Lake, miles 
north of Lake Ontario The specimens I have seen were 
in quartz rock, and had a specific gravity of 4.62. I have 
Seen it from thence in groupes of large octohedrons. Gran- 
ular masses occur in the gneiss of the bay of St. Paul, L.C. 
and it abounds near the falls of the Chaudiere on the Ottawa. 
It occurs in the trap of the Montreal mountain ; but on- 
ly in smal] quantity. 
* See the note at the end of this article 
