Localities of Minerals. 239 
connexion with hornblende, perfectly pure, except that it 
contains cobalt ore, like the hornblende of Monson and 
Chatham. 
{In Brimfield, in Massachusetts, the stone wall, near the 
‘house of Dr. Lincoln, and of the widow of Gen. Eaton, 
abounds in adularia. The feldspar part of a large portion of 
the granite and gneiss of that vicinity, is supplied by the 
most beautiful adularia. The sulphuret of molybdena, also 
is there very common—it is found chiefly, in veins of granite 
which traverse gneiss. : 
% * * ¥ *  * * 
Localities of Mine ajs, observed principally in Haddam,* 
in Connecticut, Hi Sat 1819, by Dr. J. W. Wester. 
Communicated in various letters to the Editor. — 
T have discovered a new locality for tourmalin of great 
beauty, and of remarkable regularity of form; it is about 
one mile beyond the rock which Col. Gibbs blasted, some 
years since, for small, short Tourmalin, which rock, is in 
€ road, four miles from the inn, at Haddam. The strata 
in this place, are, mica-slate and gneiss, frequently alterna- 
ting, and passing into each other, traversed by veins of gra- 
Nite of various size ;—following the beds of these rocks, 
through a thick wood, I observed the tourmalin increase in 
quantity, and size, towards the more elevated part of the 
eds of mica-slate, a blast being made, the rock appeared 
Wholly composed of a yellowish granular quartz, and black 
tourmalin, which were thrown out in profusion, being easily 
Separated from the granular quartz. Every crystal was per- 
fect, having three lateral planes, and being terminated at 
each extremity with three; the terminal planes set upon the 
lateral. The diameter varies from 1-6 to 1-2 an inch, but 
T afterwards observed some with a diameter of two inches, 
less perfect however. iat ae ; 
In another letter, it is remarked, I have found a new locali- 
_ ty of black tourmalins, all doubly acuminated, and none less 
than an inch and a half in length, by one in diameter. 
* Haddam is about twenty miles from the mouth of Connecticut river, 
9n its western bank, and about 100 miles N. E. from New-York. 
