42 Geology and Mineralogy of apart of Massachusetts, &c. 
ing upon each side of the line—they have a truly plumose 
appearance. It occurs in masses which have a relatively 
close or compact appearance, but the fracture of which 
shows the feathery structure. It is found in Williamsburgh. 
8. SCHORL. 
Var. 1. Common. 
Small six sided prisms in mica-slate, Williamstown. In 
some of its forms it is a very common mineral in the prim- 
itive rocks. In the veins of granite found in the mica-slate 
of Middlefield, Chester, and the town east of it, Norwich, 
schor] occurs in nine sided prisms with triedral termina. 
tions, and also terminated by four faces, one of which is 
perpendicular to the axis, and sometimes by six faces. 
Emmons. 
Var. 2. Tourmaline. 
Indicolite and green tourmaline, are found in a vein of 
granite in mica-s ate, with siliceous feldspar, beryl, prismat- 
ic miea, garnet, green feldspar, and rose red quartz. These 
kinds of tourmaline are the same as those found in Ches- 
terfield. One crystal of the green has been found there, 
two inches in diameter. The locality is two miles south of 
the meeting house. in Chester. It is well known that the 
rubellite of Chesterfield is often contained in prisms of green 
tourmaline; the contained mineral, however, is sometimes 
nearly white: isit the white tourmaline 2? or white rubellite? 
The large crystal of green tourmaline at Chester, contained 
one ofindicolite. Emmons. , 
9. FELDSPAR. 
Var. 1. Common. 
Abundant in the granite, often decomposing. Often in 
crystals in Middlefield and Chester, forming Seni 
granite. 
