Geology, ^c. of the Connecticut* 207 



ide disseminated in sandstone, and mixed with a small pro- 

 portion of green carbonate of copper. How productive this 

 mine has been, I do not know. 



1 1 . Vein of Green Carbonate of Copper and Pyritous Copper 

 in Greenfield Mass. 



This is found on the west bank of Connecticut River, 

 one hundred rods below the mouth of Fall river, and about 

 the same distance in a direct line from Turner's Falls. It 

 occurs at the junction of the greenstone and red s^ate of the 

 coal formation, and passes obliquely into the hill of green- 

 stone on the one side, and into the slate on the other in the 

 bed of the river. The principal vein is five or six feet in 

 diameter, and the matrix, toadstone, vi^hich is traversed, 

 in the direction of the vein, by several veins of sulphate of 

 barytes, which form saalbandes. The principal ore that 

 appears at the surface is the green carbonate, the pyritous 

 copper being rarer. 



12. A similar veiyi in the same township. 



About a mile below the vein just described, (down the 

 stream,) is another, which I am told is very similar and 

 therefore needs no description. In other places between 

 these veins, I have noticed, in the red slate, veins of the 

 green carbonate of copper, not more than a quarter of an 

 inch thick, while the walls are glazed so as to resemble pol- 

 ished steel; constituting handsome specimens of the Sfe/c- 

 rnside of the Germans. 



Mines, Veins, and Beds of Iron Ore. 



13. Micaceous Iron Ore in Veins, in Montague^ 



Near the north line of the town, a little south west of the 

 mouth of Miller's river, a granitic hill of considerable extent 

 and elevation is traversed by veins of this ore in all direc- 

 tions ; constituting one vast stock werke. The principal vein 

 is nearly ten feet in diameter, and the gangue is quartz. I 

 do not see why this ore could not be profitably wrought. See 

 Journal of Science, Vol 1, p. 438, where this ore is descri- 

 l»ed under the general name of specular oxide of iron. 



