On the Rocks, Ores, and other Minerals on the Property of the Marquess of Breadalbane in the Highlands of Scotland

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Abstract
Mica-schists, &c .—On the property of the Marquess of Breadalbane (measuring in a curve nearly 100 miles from east to west, through Perthshire and Argyllshire) mica-schist predominates. The high mountains (Ben More, Ben Lawers, and others) forming the nucleus of the Grampians consist of the same rock, which throughout the property exhibits its many varieties of mineral character, and includes talc-schists, chloritic schist, and hornblende-rocks, often to a great extent. In juxtaposition to the mica-schist, in the northern and north-western part of the district, gneiss and granite appear. Among the more useful subordinate rocks is a calcareous variety of the mica-schist (limestone), in beds and in lenticular masses, containing as much as 90 per cent. of carbonate of lime. Another stratified rock found in close connexion with the mica-schist is clayslate, lying on the north side of Ben Lawers, and at a great elevation. The difficulty of access is the only cause why it is only rarely used as roofing-slate. These subordinate strata participate in most cases in the general bearing of the mica-schist, which is nearly east and west; while the dip of the mica-schist, though in general low, appears as often exceptional as conformed to rule. While in special cases the underlie surrounds the several axes of elevation, sloping from them on all sides, both the strike and dip are not unfrequently altered by the appearance of eruptive rocks and other disturbing masses, as, for instance, by intersecting veins and ridges of quartz. The latter mineral in general seems

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