Geology^ S/c, of the Connecticut. 205 



The blende is much les<5 abundant. The vein is several feet 

 wide, traverses mica slate and granite, and has been conside- 

 rably wrought. 



5. Lead Mine at Middletown, 



I am unacquanted with the geological situation of this 

 mine. 1 put it down on the authority of Professor Silliman 

 in Cleaveland's Mineralogy. 



6. Vei7i of Galena at Bethlehem. 



I mention this on the same authority without any person- 

 al knowledge of it. It is, however, a little beyond the lim- 

 its of the map. 



7. Vein of Galena and Pyritoiis Copper in Southington. 



Same authority — gangue, sulphate of barytes and quartz, 

 I believe this vein occurs in the coal formation. 



S. Mine of Galena, Blende and Pyrites in Berlin, 



This occurs in greenstone, at its junction with the coal 

 formation. The gangue is sulphate of barytes. The galena 

 crystals are small ; those of the blende larger ; th<- pyrites is 

 the least abundant. The vein is not now wrought. (Vide 

 Dr. Percival's Notice, Journal of Science, Vol. 5. p. 44.) 



Copper Mines and Veins. 



It has already been mentioned, in the geological part of 

 this sketch, that these ores (like the mine of galena &;c. last 

 mentioned,) exist along the junction of the greenstone with 

 the coal formation. The veins frequently pass into both 

 rocks, and are of various sizes and of frequent occurrence. 

 Indeed, they may be found probably every mile or two 

 along the line, where these rocks unite. A few of them^ 

 that have obtained some notoriety will be mentioned. 



