SO On Minerals near Lake Superior* 



Point Tonuerre, are about fifteen hundred feet high; and 

 with these exceptions, the north coast may be said to be 

 bounded by mural green stone cliffs, and rounded granite 

 mountains, varying in height from two to six hundred feet. 

 Feldspar porphyries, silicious conglomerates, gray wacke, 

 green stone, green stone slate, and sand stone, are seen at the 

 bases of the cliffs, as there resting upon, or underlying the se- 

 veral formations to which they appertain. 



The mineral substances that I observed were, 



Acicular crystals of epidote, lining cavities of the green 

 stone amydaloid, adjoining the Gros Cap. 



Compact amorphous yellowish epidote, in veins in green 

 stone near Gros Cap. 



Calcareous spar, brawn and white, filling cavities of a dark 

 brown amygdaloid, twenty miles from Gros Cap. 



Satin spar, with straight and curved fibres, white and pale 

 pink, filling narrow vertical fissures, in basaltiform green 

 stone, fifty miles from Gros Cap. 



Fibrous hornblende, calcareous spar, and quartz asso- 

 ciated, in the green stone cliff, SE. cape of Michipicoten 

 Bay. 



Earthy Chlorite, same place. 



Fluate of lime, purple and green and massive, in nodules of 

 calcareous spar in the brown trap amygdaloid, six miles east 

 of Michipicoten Bay. 



Zeolite, fibrous and radiated, white and pink, in green 

 stone amygdaloid. Gorgontoit, Lake Superior. 



Stilbite, red and massive, same locality. 



Calcedonies, agates, and camelians, in green stone por- 

 phyry, same locality. 



Green stone porphyry, having crystals of yellow feldspar in 

 groupes or stars, same locality. 



Sulphuret of iron, in cubic crystals, in the granite (sienitici 

 of the Petits ecrits. Lake Superior. 



