232 Geology^ ^c. of the Connecticut. 



1. Fibrous Malachite. At Cheshire, &:c. in small but good 

 specimens. (Silliman.) ^ 



79. Arsenical Iron ? or Arsenicftl Sulphxtret of Iron ? At 

 Gill in a loose mass weighing several pounds. Found by 

 Dr. Alpheus Sione. 



80. Sulphurel of Iron. (Pyrites — Iron Pyrites.) This is 

 found in ewexy town and in almost every rock along the 

 Connecticut ; as in the bituminous shale at Westfield and 

 Sunderland, compact and amorphous; also in other rocks 

 of the coal formation. Also at Plainfield, disseminated in 

 limpid quartz. Also at Hawley, compact and unmixed with 

 any gangue Also at Halifax, \ermont in an immense 

 mass fouml in digging a cellar. Also with micaceous oxide 

 of iron at iVloatague. Al o at the Southampton lead mine, 

 beaoilfully crystallized in octaedrons which are truncated in 

 all their angles. It is grouped or insulated on crystallized 

 quartz, and the crystals are about as large as a small shot, 

 yet perfectly distinct and weil marked. 



81. Magnetic Sulphuret of Iron. At Brookfield, abundant 

 in granite. Also at Huntington with bismuth, &tc. (Silli- 

 man.) Also near Woodbury in gneiss. (Jiaton.) 



82. Arsenical Sulphuret of Iron. At Derby Middle- 

 town, and the Chatham Cobalt mine. (Silliman.) Also at 

 Leicester, Mass. in gneiss. (Dewey.) 



83. Magnetic Oxide of Iron. At Somerset, Vermont, 

 in beds from one inch to two feet thick, in mica slate. (J. 

 A. Allen.) At Chatham, near the bank of the river, oppo- 

 site the upper ferry in Haddam, in a granite vein with 

 schorl, actynolite, garnets, &cc. The crystals are octae- 

 drons, well defined, and often nearly an inch in diameter. 

 Also at Plainfield, Shclburne^ Athol, Shutesbury, &c. in 

 smaller octaedrons in mica slate and gneiss. Also in beds 

 in talcose slate at Hawley. Also in beds in Bernardstown. 



1. Iron Sand. At West Haven beach abundant. (Silli- 

 man.) Also on the beach near the Light House in East 

 Haven in great abundance. Also a little below Turner's 

 Falls in Gill, on the southeast bank of Connecticut river. 



