Geology of Lake Superior. 33 
25. In classing the minerals which we _ noliced on 
Lake Superior, we shall follow the system of Professor Jame- 
son, third edition, published in 1820. He has divided mine- 
rals into three classes: earthy, saline, and metalliferous. 
All the minerals hitherto observed on Lake Superior are re- 
ferable to the first and third classes. As it is not our inten- 
tion to describe these minerals, we shall confine ourselves to 
noticing their geological and geographical situation, with 
such occasional remarks as may be thought of interest. 
CLASS FIRST.—NARTHY MINERALS. 
GEOLOGICAL AND G2OGRAPHICAL SITUATION. 
ORDERI. Gem.—Genus 10th, Garnet. 
Is found disseminated in very small crys- 
tals in sienitic granite, near east point of 
Neepigon Bay, L. 8. Also, in mica 
Comson Garnet.¢ slate and horublende rock, north coast, 
Lake Huron. ‘The latter occurs on the 
Ile aux Outardes 5 or 6 miles east of the 
French River. 
Genus 13th, Quartz.—1st Species Rhomboidal Quartz. 
Is found in veins in Thunder Bay, as« 
sociated with black and brown crys- 
Common Ametnysr.% tals of quartz. Also in agate balls and 
tee in amygdaloid wherever that 
rock is found. 
Occurs in drusy cavities in amygdaloid of 
Roce. Carers, { the North coast, &c. te 
Rose Quarrz. In veins and druses in amygdaloid. 
Mirky Quartz. Do. do, do. 
Fisuovs Quartz. In nodules do. 
Occurs as a component part of the gra- 
nite, sandstone,&c, in imbedded crystals, 
Common Quanrz. in porphyry, and in veins in the granite, 
greenstone, and amygdalvid. 
The first is found in clay slate, Falls of 
Kakabika, Kaministiqui-a River, Also 
in fragments in the alluvium near Fort 
Furry Srare William. Lastly associated with other 
AND slates in the slate islands. 
Ly pian Srone. The second occurs in thin strata, alter- 
nating with slate, supposed to belong to 
the greywacké formation, Wedge Island 
Neepigon Bay, &c. Fuint. 
L 
