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Updated: July 19, 2025
In a little while we struck on the Nile, where it was running like a fine Highland stream between the gneiss and mica-schist hills of Kuku, and followed it down to near where the Asua river joined it. For a while we sat here watching the water, which was greatly discoloured, and floating down rushes.
It has a base of dark green with angular crystals of felspar of a lighter green imbedded in it. It is a truly eruptive rock, occurring in intrusive bosses, or in beds interstratified with gneiss and mica-schist, and owes its various shades of green to the presence of copper.
In Great Britain, those members of the series which approach most nearly to granite in their composition, as gneiss, mica-schist, and hornblende-schist, are confined to the country north of the rivers Forth and Clyde.
From Chakoong to Choongtam the route lay northwards, following the course of the river, or crossing steep spurs of vertical strata of mica-schist, that dip into the valley, and leave no space between their perpendicular sides and the furious torrent.
At Low's Harbour, however, a set of great parallel dikes, one ninety yards and another sixty yards in width, have been guided by the foliation of the mica-schist, and hence are inclined westward at an angle of 45 degrees: these dikes are formed of various porphyritic traps, some of which are remarkable from containing numerous rounded grains of quartz.
Worms appear to act in the same manner in New Zealand as in Europe; for Professor J. von Haast has described a section near the coast, consisting of mica-schist, "covered by 5 or 6 feet of loess, above which about 12 inches of vegetable soil had accumulated."
The rocks above Laghep were gneiss; below it, mica-schist, striking north-west, and dipping north-east, at a high angle. The name was given in honour of the memory of my friend, the late J. F. Cathcart, Esq., of the Bengal Civil Service.
Both of these alternate with gneiss or mica-schist, or pass into those rocks by the addition of mica, or of feldspar and mica.
No; it was a cottage-garden, surrounded by disconnected slabs of mica-schist, standing like little menhirs. peasant family lived in the wretched dwelling, exposed to the full force of the howling winds, and striving continually with nature for their black bread and the vegetables that give flavour to the watery soup. A young man with a béret on his head overtook me.
ACTINOLITE SCHIST is a slaty foliated rock, composed chiefly of actinolite, an emerald-green mineral, allied to hornblende, with some admixture of garnet, mica, and quartz. MICA-SCHIST or MICACEOUS SCHIST is, next to gneiss, one of the most abundant rocks of the metamorphic series. It is slaty, essentially composed of mica and quartz, the mica sometimes appearing to constitute the whole mass.
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