a a 
1 Last of Minerals and Organic Remains. 63 
in long. 92°20’. In Rainy Lake, these crystals are ex- 
tremely small; in very oblique four sided, and in{six sided 
prisms, and in twin crystals. In both localities they are 
numerous, and imbedded in the same gneiss, which, with 
frequent transitions into mica-slate, greenstone, &c. here 
overspreads a great extent of country. : 
n the river Lacroix, the staurotide occurs in the second 
portage from the lake, and is frequently an inch long, and 
two thirds of aninch broad; and in excellent condition. 
Amethyst.— Lake Superior. Found also by Major De- 
lafield; (a remark which extends to all the minerals found 
in Lakes Superior and Huron.) It presents itself in six sided 
prisms of good color, in druses and geodes of amygdaloid. 
This rock occurs in great quantities, on the north shore 
of this lake, and in the adjacent islands. It is intimately 
connected with the old red sandstone formation, is adja- 
cent to, and passes into clay porphyry, which graduates 
into the sandstone. Limestone, with orthoceratites, tri- 
lobites, encrinites, and other fossils, characteristic of the 
cavities of the limestone of Quebec, in extraordinary quan- 
tities, and of great brilliance. They are generally ae 
imposed laterally, or terminally, seldom imbedded. The 
form is the six sided prism, “with the ordinary pyramidal 
acumination. They are often much flattened, seldom 
equi-angular, and frequently the prism disappears, leaving 
a dodecahedron. The crystals are single or agglutinated ; 
being in the latter case, full of rents, and of brown earthy 
matter ; and in rare instances, eontain a drop of pale bitu- 
—— liquid. They are either colorless, or dark smoke 
rown. 
Radiated Quartz.—Point Marmoaze, Lake Superior, in 
amygdaloid, nearly filling a geode with imperfect crystals. 
radiating in a stellular form from three centres. 
ky Quartz.—In the outlet of Lake Ontario, four 
miles below Kingston, this species of quartz exists in large 
strata, subordinate and conformable to gneiss, and in the 
calcareous puddingstone covering it. 
