Schoolcraft’s Localities. 49 
_ Chalcedony.—At Point. Keewiiweenony Lake Superior, 
imbedded in Amygdaloid, in globular masses from the size 
of an ounce ball to that of a hen’s egg. Also, very plenti- 
fully, along the shore, more or less abraded. 
Agate.—With the preceding. Imbedded, or detached. 
All the specimens which I have obtained from this place are 
Onyx agates, consisting of parallel stripes of variously col- 
oured chalcedony, jasper, hornstone or quartz. They va- 
ry in size from small nodules, to that of a 32 pound shot. 
When broken from the rock they present a uniform dull 
brick red surface, which is worn off from the masses tbat lie 
along the shore. I possess the fragments of a single speci- 
men; that was probably 5 inches in diameter, in. which the 
outer layer, which is ,4,ths of an inch broad, is a light vio- 
let coloured umethyst. ) vasteses} 
Mica.—This substance is so generally wanting in the 
granitic rocks of this region, that 1 -had-doubted whether 
Gihite 
a ne: read 
It exists, however, in the granite of the Porcupi 
tains of lake Superior, in large folia, of a silvery and some- 
what pearly hue. The specimens brought to me from 
those mountains, in the course of tbis season, are connect- 
r 
loose masses along the banks of the river. It assumes vari- 
‘us imitative forms. © H.R. S. 
J uly, 1823, 
Ant. 1V.—Localities of minerals, communicated by Dr. 
| ELAM Meape. ; 
Philadelphia, April 9, 1823. 
Sir, 
Having made an extensive tour last Summerto the East- 
ward, particularly in the States of Connecticut and Massa- 
Vou. VILL—No. 1. Ss 
