232 Geology, &c. of the Connecticul. 
1. Fibrous Malachite. At Cheshire, &c. in small but good 
specimens. (Silliman.) : 
79. Arsenical Iron? or Arsenical Sulphuret of Iron? At 
Gill in a loose mass weighing several pounds. Found by 
Dr. Alpheus Stone. 
80. Sulphuret of Iron. (Pyrites—Iron Pyrites.) This is 
found in every 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, Vermont, in an immense 
mass found in digging a cellar. . Also with micaceous oxide 
of iron at Montague. Also at the Southampton lead mine, 
beautifully 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 well marked. = 
81, Magnetic Sulphuret of Iron. At Brookfield, abundant 
in granite. Also at Huntington with bismuth, &c.  (Silli- 
man.) Also near Woodbury in gneiss. (Eaton.) - 
82. Arsenical Sulphitret of Tron. At Derby Middle- 
town, and the Chatham Cobalt mine. (Silliman.) Also at 
Leicester, Mass. in gneiss. (Dewey.) . 2 
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, opp0- 
site the upper ferry in Haddam, in a granite vein with 
schorl, actynolite, garnets, &c. The crystals are octae- 
drons, well defined, and often nearly an inch in diameter. 
Also at Plainfield, Shelburne, 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. fron Sand. At West Uaven 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. 
