Geology, &c. of the Connecticut. 209 
in giving a list of the simple minerals, I do not intend to be 
scrupulously confined to the region embraced by the map. 
is mine is wrought in a bed in clay. For further partic- 
ulars see Prof. Silliman’s — of this ore, in the Journal 
of Science, Vol. IL. p. 212 
18. Mine of the same ore, in Kent, in Connecticut. 
This is found, like the last, in a bed in clay. See Vol. 
IT. of the Journal of Science, P- 216. 
19. Mine of Carbonate of Tron, in New- Milford, in Connecti- 
cut. : 
This exists in a vein, in gneiss ; é geeks its s gangue is quartz. 
See Journal of Science, Vol. ate 
20. Bed of Bix: Iron Ore, oa n Nezw- Braintree, i in Massachu- 
Se 
This ore is not uncommon along the Connecticut; but | 
have never examined a bed of it, except in New-Braintree, 
in Massachusetts. It lies in a valley, ina country of gneiss, 
only a few feet below the surface; and has been explored 
to a considerable extent. 
2h Mine of oro Sct Seal in peas mn Connecti- 
It exists in a bed, ia mica sate: varying in a width from a 
few inches to afew feet. The matrix is a mixture of horn- 
blende and actynolite, in which the ore is disseminated. _It 
was explored several years since, and has been again open- 
ed recently; the undertaking is now, however, abandoned. 
Arsenical sulphuret of iron, arsenical nickel, and arsemiate 
of cobalt are found in this mine in smal! quantities. 
Vor. VI.—No. Il. «eer 
