On Cupellation with the Blowpige. 409 
deep. I found in all of them the oxyd of nickel, in quantity pro- 
portioned to the depth of color of the specimen. In some of 
them, the green color seems to be an exterior coating and in 
others to penetrate the mass uniformly. These specimens: of 
carbonate of magnesia are not crystallized although they appear 
to be so, but are only a congeries of little spherical grains about 
tha Of an inch in diameter, which are cracked in radii from the 
centre. 'The same appearance, resembling aggregations of crystals, | 
[have observed in one specimen of the hydrate of nickel which 
led me at first to suppose that I had found it crystallized. The 
constitution of the chrome iron on which this new mineral is 
d, now becomes an interesting inquiry. I owe these and 
Many other interesting minerals from the same region, to Mr. 
L. W. Williams, of Westchester, Pa. . 
Norr.—Since these observations were made, I have seen a mention in the Pro- 
ceedings of the Boston Nat. Hist. Soc., Nov. 18, 1846, from Dr. Jackson, oF a 
mineral, as I learn from Dr. Jackson, is from the same mines as the 
