224 Geologtj, ^c. of the Connecticut. 



place, 1 have found prehnite crystallized in groups on chai- 

 cedony; but could not determine the form of the crystal. 

 Also near Bellows Falls in primitive rocks. I saw speci- 

 mens in the cabinet of Dr. Wells; but was not informed of 

 the precise locality: yet the mica attached to the speci- 

 mens indicated their detachment from the older classes of 

 rocks. 



43» Slilhile. At Woodbury, v/ell characterized. (Silli- 

 man.) Also at Deerfield in secondary greenstone ; usually 

 associated with chabasie. Its crystals appear to be right 

 prisms, -whose bases are rhombs with angles of about 60° 

 and 120°. They rarely exceed one tenth of an inch in 

 their longest direction. They are frequently grouped so 

 as to become mere fohated masses. The lustre of the fo- 

 lia is pearly, and they are usually a little curved; color 

 white. On hot coals it whitens and before the bJow-pipe 

 intumesces aiid melts into a white spongy enamel. It is but 

 rarely met with. 



44. Zeolite. Near New-Haven it is found in secondary 

 greenstone, crystallized, or radiated, or mealy. (Silliman.) 

 Also at Deerfield, in radiated fibrous masses, sometimes as 

 lani^eas a musket builet,or more_rarely an inch in diameter. 



45. Laumonite. In secondary greenstone, also in loose 

 rolled masses of pudding-stone near New-Haven. {Silliman.) 



4G. Analcime. At East-Haven, with chalcedony and 

 agates. {T. D. Porter.) Also at Meriden, Connecticut. 

 {Silliman.) Also at Deerfield, usually in laminated or ra- 

 diated masses, wliich are reniform, cylindrical and nearly 

 spherical. Very rarely in trapezoidal crystals — color white, 

 grey and flesh-colored. Associated with calcareous spar, 

 quartz, chalcedony, &c. and frequently effervesces a little 

 with the acids. 



.47. Chabasie. At De.erfield, in cavities and seams in se- 

 condary greenstone; usually crystallized in transparent, or 

 brownish, or yellovi'ish crystals; presenting the primitive 

 form, from one twentieth to one fourth of an inch in diame- 

 ter, insulated and grouped on limpid, pscndomorphous and 



