In the 64th degree of latitude, in a firth called Ame raglik, in the south of the Danish colony Godthaab, (Good hope,) a variety of mica slate is found, which passes into talc slate, forming a very small layer in coarse granular granite. It is very remarkable, on account of the large groups of tourmaline which occur, imbedded or rather involved in talcose mica ; and which are the largest crys tals of this fine mineral that have been met with. At the end of the same firth, Auaitsirksarbick, in the neighbour hood of the great continental glacier, the finest garnets are found. They are of a lamellar texture, and surpass the oriental specimens in colour, lustre and hardness. At the same place, dichroite and hyperstene of a beautiful blue colour occur, along with precious garnet, in decom posed mica slate.
All the lower mountains from the 66th to the 71st de gree of north latitude, and particularly all the mountains of the continent forming Disko bay, with the greatest part of the adjacent islands, are composed of mica slate. There is scarcely a square mile where the rock is entirely free from garnets. A large mountain in Onienaks firth, called Sedliarusmt, presents on its surface only the pow der of mica slate, and fragments of precious garnet.
From the appearance of this powder, it is probable that the rock formerly contained great masses of imbedded iron pyrites. No snow rests on the surface of this moun tain in the coldest winter. The fragments of precious garnet which are found here, when clear, are the most highly prized of any on the coast. Other minerals which are found in mica-slate in Greenland, are, emery, on the island Kikertarsoeitsiak, in South Greenland ; granatite, on the island Manetsok ; moroxite, in very large six-sided prisms, at Sungangarsok, in North Greenland ; and dich roite, in six-sided prisms, on the island Ujordlersoak, in the 76th degree of North latitude. Except iron pyrites, copper pyrites and galena, no metal occurs in this Pock.
White-stone, (Weiss-stein,) which has lately been de termined by \Verner, appears to belong to this rock. It presents a white and greyish-white granular appearance, which was formerly supposed to be compact or granular felspar. It is in this country characterised by very small and minute crystals of garnet disseminated through the whole mass. Here it is found in layers of inconsiderable extent, resting on mica slate, very seldom on gneiss. It is also found in detached pieces. •