Rocks and Minerals of Westfield. 215 
In West-Springfield, 6 miles east of Westfield Academy, I 
find veins of 
4. Coal, in rocks called the coal formation in Hitchcock’s 
geology of Connecticut river. The veins are numerous, and 
generally contain either imperfect rhombic crystals of lime, 
diagonals 3 inch, or satin spar. 
5. Sulphate of Lime (gypsum) is found between the layers of 
slate. It resembles fish scales, } inch in diameter; easily 
detached from the slate. It immediately turns white before 
the blow-pipe, does not effervesce with acids, and affords 
small rhombic crystals by cleavage. 
6. Bituminous Marlite is found near this place. It hasa slaty 
structure, though not easily split. It has a conchoidal frac- 
ture, and a glimmering lustre. When pulverized eflervesces 
strongly with acids, and by pounding yields a bituminous 
odour. It contains 
7. Pyritous Copper in irregular concretions. The globules, 
when broken are often beautifully pavonine. 
North of this locality, 4 miles, is a bed of 
8. Bituminous Carbonate of Lime. It yields a strong bitu- 
mineus odour. Sp. gray. 2.62. It was formerly burat for 
lime. 
[ have seen one specimen of an icthyolite, found in the 
vicinity of the bituminous marlite. 
Westfield, Sept. 16th, 1825. 
APPENDIX TO THE ABOVE PAPER. 
REMARK BY THE EDITOR. 
Mr. Chilton has been so ebliging, as to perform the following experi- 
ments upon the unknown mineral, mentioned in Mr. Davis’s account, 
and which has been suspected by him, to be Petalite. In the want ofa 
fuller analysis, which we are allowed to look for, these notices may be 
useful. 
Twenty-five grains were fused with half their weight of 
potash ; after solution in muriatic acid, evaporation, &c., the 
dry mass was covered with alcohol, Sp. gr. 8.25, repeatedly 
shaken in a vial, and suffered to stand till the nextday. The 
