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Geology of Lake Superior. $5 
in amygdaloid, wherever that rock is found, 
The finest specimens were taken from Gar- 
gantua, and the south side of Michipicoten 
Island, 
ORDER II.—Spar.—Genus 5fh. 
Fecsran.—Besides forming a component part of sienitic gra- 
nite, and of the trap rocks, felspar is present in 
grdins in the sandstone. It also occurs in veins 
in the former rock, and imbedded crystals, (red, 
white iron rust brown, & glassy,) in clay, porphy- 
ry, and greenstone. In trap sienite, the greenstone 
and oxide of iron colour the felspar muddy 
green, or dark reddish brown, 
Compact felspar is, in all probability, the 
principal ingredient in the base of the porphy- 
ries. 
Cray Famity. 
Cray Stone,—Ncear the entrance of Neepigen river. It is 
probably connected with the clay porphyries. 
It is dark red, or brick red, opaque, and just 
sufficiently soft to be cut with the knife. ‘The 
Indians make their pipes of it ; and, in their 
possession, we have seen grey varieties, the 
locality of which we could not ascertain. 
Ixpunkatep Cray, on Lirnomanrge, 
Green axp Rep.—Is found in thiu layers, in the old red 
sanstone of Ile St, Ignace, mouth of Neepigon 
Bay. 
Genus 8th. 
Honxevexpy.—Besides forming a component part of sienitic 
granite, &c, was met within large black crys- 
tals, in sienitic granite near Peniusula Harbour, 
North Coast, Lake Superior. 
ORDER L.—Spar,—Genus 8th. 
Er:vore,—Occurs in minute crystals in druses and fissures 
in porphyry of Gros Cap, (Bigsby.) Also ia 
E2 veins, 
