No. 50.J 
87 
while I have no doubt that several distinct minerals have heretofore 
been confounded under the name of asbestus. I have not satisfied my- 
self of the identity of our mineral vi^ith that just mentioned. Some of 
the specimens found here have a fibrous structure, and a silky lustre, 
but on treating them vv^ith acids they effervesce, and after dissolving out 
all the magnesian carbonate of lime, bundles of amianthoid fibres re- 
main. I have reason to believe that all the different fibrous minerals 
found here are mixtures of asbestus v^ith serpentine or magnesian car- 
bonate of lime. 
The following is an enumeration of the remaining minerals found in 
this county : 
Pyroxene — The variety coccolite, of a white colour. It is made up 
of grains of various sizes and resembles dolomite — Philipstown. 
Diopside or white augite, associated with the preceding. It has a 
grey colour, and foliated structure. 
Tremolite — Often associated with yellowish serpentine. 
Chrome iron ore — In octahedral crystals — One specimen has a crys- 
tal with the base J of an inch in diameter. It resembles spinelle, but 
its powder is attracted by the magnet, and its blow-pipe characters 
agree with those of the chrome ore — Philipstown. 
Scapohte, in small crystals or grains. 
Phosphate of lime, in very minute crystals. Both these are found 
at the above locality. 
Peat — Several localities, according to Mr. Mather. 
Graphite — Often found in small quantities. 
Arragonite ? — In concretions on dolomite, near Patterson. 
Hyalite — Associated with iron ore at the Philip's ore bed. 
Basanite — Loose masses on the banks of the Hudson. 
Kerolite — Philipstown . 
Brucite — Near the Townsend ore bed. 
Hornblende — Several varieties. Actynolite, found at Brown's quar- 
ry. Tremolite — very abundant in the dolomite near Patterson. 
Asbestus and amianthus, in long and tough fibres — Abundant near 
Patterson. 
Schiller spar, of Dr. Thomson— Brown's quarry, (see appendix.) 
Feldspar — Several varieties. 
