Geology, Sc. of the Connecticut. 205 
The blende is much less abundant. The vein is several feet 
wide, traverses mica slate and granite, and has been conside- 
rably wrought. 
5. Lead Mine at Middletown. 
IT am unacquanted with ihe geological situation of this 
mine. I put it down on the authority of Professor Silliman 
in Cleaveland’s Mineralogy. 
6. Vem 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 Pyritous Copper in Southington. 
Same authority—gangue, sulphate of barytes and quartz. 
I believe this vein occurs ia the coal formation. 
8. 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 ; the 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 ei 
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 
