a 
New Locality of Amethyst. ie* 
. New Locality of hsreak ge age by Pro- 
ssor J. Apa 
Amethysts have lately been found at Bristol, Rhode Is]- 
and. ‘Ihe Jocality is on the shore of Mount Hope Bay, 
a branch of Narragansett Bay. A Hiieeé number of speci- 
mens has been found, some of which are peed | crystalli- 
zed. A few are large and beautiful. ‘Two or three have 
been wrought into elegant personal arava: Many of 
the specimens have been procured from among the sand 
and gravel, at and near low water mark. ‘This sand is 
formed by the constant decomposition of an immense 
n 
discovered by digging into the rock, especially that part of 
it which contains quartz. Most of the mass of rock in 
question, is feldspar nearly pure. Very minute specks ot 
mica are scattered through it, but they are extremely rare. 
Phe mass is occasionally traversed by thin strata of quartz, 
nearly in a vertical situatio 
At this locality of cha yited found also, two specimens 
of micaceous iron, and upon the shore near ¢ 
place, a great number of crystals of iron. (Sulphuret of 
iron.) Many of them ure very large, crystallized in cubes, 
whose sides are froma half to three quarters of an inch 
square in their dimensions. They are imbedded in a 
hard, light coloured clay slate. This locality of amethysts 
is about two miles from Bristol village, and near the ferry 
Which leads from Bristol to Rhode Islan 
The e region in which these minerals are > found, is a part 
of the transition formation which extends from Narragan- 
sett to Massachusetts Bay. This traasition formation rests 
pon a primitive foundation, and does not appear to be 
very thick ; 3 since in sinking walls, we sometimes penetrate 
into the primitive rocks, and in some places, the primitive 
rises upwards through the incumbent transition formation. 
This is the case with the summit of Mount Hope, which is 
granite, and with the mass of rocks which form the locality 
of amethysts above mentione 
