Geology and Mineralogy of a part of Massachusetts, &c. 45 
a quarter of an inch in diameter. It oe into a yellowish 
glass, which is translucent. There is little reason for 
doubt about this mineral, though so rare in our country. 
The form seems to be a prism terminated by low pyramids 
Found in Chester associated with actynolite, epidote 
chlorite, &c. ; and also in age Emmons. 
16. PREHNITE. 
In the secondary _. at West Springfield, in ra- 
diated masses. 
17. STILBITE. 
White, lustre sical exfoliates on hot coals, melts with 
intumescence; occurs in four sided prisms, whose b 
are parallelograms, as nearly a rhomb, and in failinfed 
filesh-colored or reddish masses. Sometimes a row of crys- 
tals extend side by side for several inches. Found a mile 
. of the meeting-house in Chester, and in other places i in 
fissures of the mica-slate and hornblende rok mmon s. 
v2 
18. ZEOLITE, ig 
Associated with the preceding mineral, are sometimes 
found fibrous masses, which exactly resemble fibrous zeo- 
lite. 
19. CHABASIE, 
White and yellowish, often translucent, scratches glass, 
crystals nearly cubes, and sometimes nearly half an inch in 
diameter. ogg sbi — and carb. of lime in mica- 
slate. —Ches Em 
There are beautiful cots of this mineral. 
