SILICA. 
301 
The variety, actynolite, is found in bowlders at Corker’s Hook, and in other places in the 
southern part of the island.* The variety amianthus is frequently found in thin veins in 
serpentine. The mineral formerly called Radiated asbestus, is the Hydrous anthophyllite of 
Thomson. 
Orange County. This county is rich in hornblende, in almost all its varieties. The locali¬ 
ties are principally in the towns of Cornwall, Monroe and Warwick. 
In the town of Cornwall, there is a locality four miles west of West-Point, and another four 
miles southeast of Woodbury furnace. 
In the vicinity of Florida, there is a crystallized green hornblende, which in its structure 
resembles tremolite. 
In the town of Monroe, near the Two ponds, hornblende, occurs in the white limestone. 
It is black and green. The crystals are sometimes six-sided and perfect, but they are most 
generally rounded, and have a fused appearance similar to that exhibited by many of the 
minerals in St. Lawrence county, and which is thought to favour the theory of the igneous 
origin of white limestone. At the same locality, and elsewhere in this town, long four-sided 
prisms of dark hornblende are found in trap. Near the Greenwood furnace, hornblende occurs 
in six-sided prisms with dihedral summits; and there is also, in the same vicinity, a black 
shining granular hornblende. 
Fig. 226. 
Fig. 227. 
Fig. 228. 
At the Stirling mine, crystal¬ 
lized hornblende, of a dark green 
colour, is found associated with 
ilmenite in feldspar. There have 
been obtained at this locality, the 
dodecaedre, Fig. 226 ; and the oc- 
toduodecimal of Haiiy, Fig. 227; 
and modifications of the latter 
form. The crystal represented in 
Fig. 228, has also been found in 
this town. M or M' on s 152° 
17'; M' on x 117° 43k k on k 
55° 4'; k on x 102° 22' ; r on r 
149° 38k r on x 105° IV. 
About a mile southwest of the Queensborough forge, there is a massive and cleavable va¬ 
riety of a black colour, and having a high lustre. Some specimens closely resemble pyroxene, 
and perhaps the two minerals pass into each other. 
A white lamellar variety is found associated with magnetic iron ore at the Stirling, and at 
the Forest of Dean mine. It possesses a high vitreous lustre, and is traversed by striae. The 
specimen which I analyzed approaches nearly the composition of Thomson’s raphilite; but 
our mineral is not fibrous, and is much harder. 
Gale. New-York Geological Reports, 1839. 
