42 Geology and Mineralogy of apart of Massachusetts, Oo 1 
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 i 
some of its forms it is a ay: common mineral in the prim- 
itive rocks. In the of granite found in the mica-slate 
iddlefield, Chester, and the town east of it, Norwich, 
schorl occurs in nine sit with triedral termina- 
1 2s, one of which is 
sometimes by six faces. 
i * 
Var. 9 Tourmaline. 
Indicolite and green tourmaline, are found in a vein of 
granite in mica-siate, with siliceous feldspar, beryl, prismat- 
ic miea, saree 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, 
twoinches in diameter. The locality is two miles south of 
the meeting house in Chester. It is well known that the 
rubellite of Chesterfield i is often contained in prisms of green 
tourmaline; the contained mineral, however, is sometimes 
nearly white t is it the white tourmaline 2 or white rubellite? 
The large crystal of green tourmaline at Chester, contained 
one of indicolite. Emmons 
am ed 
9. FELDSPAR. 
‘Var. 1. Common. 
Abundant in the granite, often decomposing. Often 
crystals in andar t and Chester, forming -oiphvei 
granite. 
= shu 
