Geology, &c. of the Connecticut. 236 
crystais are so grouped that it is difficult, in the specimens 
which I saw, to seize upon the precise form. I think, how- 
ever, I found the octaedron with truncated pyramids. Also 
at Leverett, foliated. 
99. Arsenical Ni er At Chatham, associated with ar- 
senical cobalt. (Pierce and Torrey.) 
100. Arsenicat Cobalt. At Chatham. (Silliman.) 
101. Arseniate of Cobalt, ‘At Chatham. Cro 
Torrey.) 
102. Oxide of Manganese. At Leieiet in alluvial sail 
forming a bed five or six inches thick a few inches below 
the surface. It isin rounded irregular masses from the size 
of a pea to.an inch in diameter and considerably resem- 
bles granular oxide of Iron. Also at a eet forming 
crusts on quartz, and mica slate. 
103. Native Bismuth. At Huntington. (Silliman.) 
104, Native Aritinnohiy: At Harwinton, Litchfield ¢ coun- 
ty, in broad plates. (Silliman.) 
105. Sulphuret of Antimony. At rine a *  (Silli- 
man.) Also near South Hadley.- (Gibbs.) 
106. Native Tellurium. At Huntington, associated with 
tungsten, bismuth, silver, &e. Cape 
107. Sulphuret of Molybdena. ° “At Saybrook. (T. 
Porter.) Also at East-Haddam and pnatesury (Silliman. ) 
Also at Brimfield. (Eaton.) 
108. Yellow Ovide of Tungsten. A new species discov- 
ered, analyzed and described by Professor Silliman. At 
Huntington i ina gangue of quartz. 
Calcareous Oxide of Tungsten. At Huntington. 
(Silliman -) 
110. Ferruginous Oxide of Tungsten. At Huntington. 
(Silliman. ) 
* 104 and 105 need confirmation.—Editor. 
