Geology^ ^c. of the Connecticut. 231 



from secondary greenstone or the coal formation. The 

 piece weighs seventeen ounces and very much resembles 

 the last mass above described, exhibiting imperfect rudi- 

 ments of octaedral crystals on the surface, and being encrust- 

 ed by green carbonate of copper. The cavities also con- 

 tain a very little red oxide of copper. 



72. Sulphuret of Copper. Near New-Haven, at Simsbury 

 mine, he. (Silliman.) 



73. Pyritous Copper. At Cheshire, Simsbury, &;c. (Silli- 

 man.) Also at the Southampton lehd mine, where it occurs 

 amorphous and crystallized in regular tetraedrons which are 

 insulated on calcareous spar. For the specimens contain- 

 ing these crystals, I am indebted to Dr. David Hunt. Also 

 at the Leverett lead mine amorphous. Also in greenstone, 

 Deerfield. Also at Greenfield in veins, in greenstone and 

 sandstone. 



74. Variegated Pyritous Copper. This occurs sparingly 

 disseminated in calcareous spar in sandstone of the coal for- 

 mation. In the island in the middle of Connecticut river at 

 the falls in Gill. 1 am indebted to Prof. Dewey for the de- 

 termination of this mineral. 



75. Antimonial Gray Copper. Near Hartford, in the red 

 sandstone formation, (coal formation .'') (Maclure.) 



76. White Copper. At Fairfield .?* Connecticut. (Silli- 

 man.) 



77. Red Oxide of Copper. At Bristol, in a vein with na- 

 tive copper. (Gibbs.) Also with native copper in the green- 

 stone mountains extending northerly from New-Haven. 

 (Silliman.) 



78. Green Carbonate of Copper. At Greenfield, near the 

 Falls in Gill, in two veins with pyritous copper, in considera- 

 ble abundance near the surface. It is amorphous and even 

 earthy. 



* There is great reason to believe that this locality is not correct. — Editor. 



