Geology and Mineralogy of a part of Massachusetts, &c. 45 
a quarter of an inch in diameter. It fuses into a yellowish 
glass, which is translucent. here 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, &e.; and also in Worthington. Emmons. - 
16. PREHNITE. 
In the secondary greenstone at West Springfield, in ra- 
diated masses. 
17. STILBITE. 
White, lustre pearly, exfoliates on hot coals, melts with 
intumescence; occurs in four sided prisms, whose bases 
are parallelograms, also nearly a rhomb, and in radiated 
flesh-colored or reddish masses. Sometimes a row of crys- 
tals extend side by side for several inches. Found a mile 
E. of the meeting-house in Chester, and in other places in 
fissures of the mica-slate and hornblende rocks. Emmons. 
18. ZEOLITE. 
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. Occurs with stilbite and carb. of lime in mica- 
slate.—Chester. Emmons. 
There are beautiful crystals of this mineral. 
