_Cyanite_ or _Sappar_, is found in great quantities, especially in Harwington and Litchfield. A crystalline mass of this was found a few years ago, weighing probably 15 cwt.; it lay on a mica slate ridge, and undoubtedly had been formerly imbedded in the slate. Beautiful white talc, and small crystals of sulphuret of iron, are disseminated in the mass. Specimens of this mass are in almost all the cabinets in America. Smaller masses have been found associated with feldspar. Small crystals of this mineral are very common in mica slate, with staurotide and garnet. Two of these crystals are often arranged at right angles with each other. In Cornwall it is found in small crystals in the gneiss containing graphite. _Staurotide_ is very common and very beautiful. It is found principally in mica slate, and exhibits often the cross. It most generally is crystallized in four-sided prisms. _Quartz_, of course, is common. Cornwall particularly is distinguished for the _smoky_ variety. Ferruginous quartz is found in rolled masses in the whole of this range. _Petro silex_, in rolled masses with ferruginous quartz, containing veins of _chalcedony_ and _hornstone_, and geodes of quartz crystals, are common in Litchfield and Goshen. Sometimes these masses in the interior assume the appearance of Burrstone. _Common opal_ has been found in Litchfield, though rarely. It was part of a mass of ferruginous quartz, with indelible dendritic impression. It is very hard, and its fracture is conchoidal. _Mica_ is very common. It is found green, white, and perfectly black. It generally occurs in blocks of granite. _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.