ALUMINA. 
337 
Fig. 309. 
of the acute lateral edges, the prismatique of Haiiy (Fig. 306), but 
differing in the relative size of the planes. The singular twin crystal, 
Fig. 309, has been found here by Dr. Horton. 
Crystals of feldspar and adularia, usually small, are found in other 
parts of the island, both in the quartz which traverses the limestone, 
and in the fissures of gneiss. Clcavable masses, often of considerable 
size, and sometimes having a reddish colour, also occur in similar situa¬ 
tions. 
Orange County. Common feldspar is of course very abundant in this county. Fine speci¬ 
mens having the primary form, and often of a flesh-red colour, occur in the vicinity of West- 
Point. A beautiful white and opalescent variety occurs at Bog-meadow pond, in the town of 
Cornwall. 
At the Long, Roberts, Patterson, Stirling and Rich iron mines, massive feldspar is com¬ 
mon ; at the two latter, it is red. 
In the town of Warwick, it is found at Rocky hill, of a white colour. At McGee’s hill, it 
is red. 
Fig. 310. 
Fig. 31], 
Of crystallized feldspar, Rocky hill in 
the town of Warwick is one of the most 
interesting localities. The colours are 
white, yellowish and reddish white. It 
is associated with tourmaline and zircon. 
There have been found here, the pris¬ 
matique of Haiiy (Fig. 306); also the 
unitaire of Haiiy, Fig. 310; and the 
sexdecimal of Haiiy, Fig. 311. 
P on x 128° 5P ; 
P on y 99° 29'; 
M on x 90°. 
Fi s- 312 - Near Amity, there is found crystallized feldspar, which is white 
and yellowish white. The prismatique of Haiiy is met with, and' 
sometimes twin crystals occur of the form represented in Fig. 312. 
There is also a locality of this variety about a mile northwest of 
Edenville, where it is associated with green tourmaline. 
Putnam County. On Hustis’ farm, in the town of Phillipstown, 
feldspar is found in laminae of considerable size, associated with 
pyroxene, etc. It is of a reddish colour. 
Richmond County. Feldspar, in thin plates, and in minute crystals having the primary 
form, occurs in the fissure of greenstone near Port Richmond, formerly Merserole’s ferry. 
This locality is the so called Granite quarry. 
Min. — Part II. 43 
