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Geology, Yc. of the Connecticut. 231 
from secondary greenstone or the: = formation. The 
piece weighs seventeen ounces and very much resembies 
the last mass above described, exhibiting a rudi- 
ments of octaedral crystals on the surface, and encrust- 
e green carbonate of copper. he cavities also con- 
tain a very little red oxide of copper. 
2. Sulphuret of Copper. Near New- Haven, at oe 
mine, &c, (Silliman. ) . 
73. Pyritous Copper. At Cheshire, Simsbury, &e. (Silli- 
man.) Also at the Southampton lead mine, where it occurs 
amorphous and crystallized in regular tetraedrons which are 
insulated on calcareous spar. For the specimens contain- 
ing these crystals, | am indebted to Dr. David Hunt. Also 
at the Leverett lead mine amorphous. Also in greenstone, 
Deerfield. Also at tewinelss in veins, in greenstone anc 
sandstone. 
74, Variegated Pyritous Copper. This occurs ease 
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. 1am indebted to Prof. es for the de- 
termination of this mineral. 
» Antimonial Gray Copper. Near Hartford, in the red 
ph whe formation. (coal formation ?) (Maclure.) 
76. White Copper. At Fairfield ?* Connecticut. it. 
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 eerecesy northerly from New-Haven. 
(Silliman.) 
78, Geen Eachus 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 ever 
earthy. 
* There is great reason to believe that this locality is not correct. —Editor. 
