10. Smoky quartz. In the trap rock Keweena Point, Lake Superior, crystallized. In connection with amethystine quartz.
11. Amethyst. With the preceding. Also, at the Pic Bay, and at Gargontwa, north shore of Lake Superior, in the trap rock, in perfect crystals of various intensity of color.
12. Chalcedony. Keweena Point, Lake Superior. In globular or orbicular masses, in amygdaloid rock. Often, in detached masses along the shores.
13. Carnelian. With the preceding.
14. Hornstone. In detached masses, very hard, on the shores of Lake Superior. Also, at Dodgeville, Iowa county, Mich. Ter. in fragments or nodular masses in the clay soil.
15. Jasper. In the preceding locality. Common and striped, exceedingly difficult of being acted on, by the wheel. Not observed in situ.
16. Agate. Imbedded in the trap rocks of Lake Superior, and also detached, forming a constituent of its detritus. Variously colored. Often made up of alternate layers of chalcedony, carnelian, and cacholong. Sometimes zoned, or in fortification points. Specimens not taken from the rock are not capable of being scratched by quartz or flint, and are incapable of being acted on by the file; consequently harder than any of the described species.
17. Cyanite. Specimens of this mineral, in flat, six-sided prisms imbedded in a dark primitive rock, were brought out from Lac du Flambeau outlet, where the rock is described as existing in situ. The locality has not been visited, but there are facts brought to light within the last two or three years, to justify the extension of the primitive to that section of country.
18. Pitchstone. A detached mass of this mineral, very black and lava-like, was picked up in the region of Lake Superior, where the volcanic mineral, trachyte, is common among the rolled masses. Neither of these substances have been observed in situ.
19. Mica. Huron Islands, Lake Superior. In granite.