Schorl, in rounded crystals, is found in all the granite in this range; in radiating crystals on quartz; and in acicular crystals on mica slate. The large crystals are so brittle, that few of them can be obtained perfect. I once found it in Litchfield, near Plymouth, in prismatic crystals on earthy graphite.
Feldspar is very common and beautiful in all the towns. It is usually found in rhomboidal fragments, and has a fine lustre. It is blue, white, and red. Some of the granite of Torringford is very beautiful, being composed of white and smoky quartz, red feldspar, and green mica. In the porphyritic gneiss, feldspar is in six-sided prisms. One small crystal of adularia, well defined, has been found by E. Wilkins, Esq.
Beryl, both crystallized and massive, is often found in Litchfield in granite. Its colours are green, greenish yellow, pale yellow, and brown. Its crystals are often very perfect.
Garnets are common in all the towns of this range.
Epidote. Very beautiful crystals of this mineral have been found in Washington, associated with feldspar. They are so rounded as to render it very difficult to discover their form. They have a very fine lustre, and are of an olive green; in Litchfield, in crystals with hornblende, and graphic granite, and in veins in sienite.
Perhaps no region can be found containing more beautiful tremolite. All its varieties occur; the fibrous of Litchfield and Bethlem is very distinguished. In Canaan, it is found containing crystals of sulphuret of iron. I do not speak here of the tremolite found in the limestone range.
Common asbestus exists in Washington and New Milford.
The white augite is a mineral found in this range; in Litchfield, in six-sided prisms very much flattened, on quartz, and carbonate of lime with tremolite. They sometimes occur several inches long.
The lamellar and slaty varieties of common hornblende are very common.