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Penzance has quite a commodious harbour, as it deserves, having spent at least £100,000 on it; there is a regular service to Scilly, a good deal of coasting, much fishing, and some ship-building. The west arm of the pier is built on a vein of felspar porphyry, visible at low water.
Repulse Island produced a compact felspar a compound of quartz, mica, and felspar, having the appearance of decomposed granite. Being too weak to travel, I sent Mr. Roper and Brown to the northward and to the north-east, to examine the country.
Malcolm is still with me; but whether servant or companion, I can scarce tell at times. When my strange imaginations come upon me for I have never been, for any length of time free from them he is almost master of my small establishment. In one of the midland counties of Scotland lies the estate of Sir Patrick Felspar.
In this case also are the Aluminates of Magnesia, including the sapphirine; the chrysoberyls from Brazil, and those inclosed in quartz and felspar with garnets.
Some rivulets had a tinge of white in them, as if of felspar in disintegrating granite; some nearly stagnant burns had as if milk and water in them, and some red oxide of iron.
Thus she contrives to intenerate the granite and felspar, takes the boar out and puts the lamb in and keeps her balance true. The farmer imagines power and place are fine things. But the President has paid dear for his White House. It has commonly cost him all his peace, and the best of his manly attributes.
The view of Professor Judd, that leucite easily changes into felspar, and that some ancient igneous rocks which now contain felspar were originally leucitic, does not seem to be borne out by the above facts. In such cases the felspar crystals ought to retain the forms of leucite. See Volcanoes, 4th edition, p. 268.
In these layers, which abut against the granite, a mixture of mica and of unrounded grains of quartz and felspar occur, evidently derived from the disintegration of the crystalline rock, which must have decomposed in the atmosphere before the mud had reached this height. Entire shells of Helix, Pupa, and Succinea, of the usual living species, are embedded in the granitic mixture.
The highly crystalline nature of the rocks, at these great elevations, is due to the action of veins of fine-grained granite, which sometimes alter the gneiss to such an extent that it appears as if fused into a fine granite, with distinct crystals of quartz and felspar; the most quartzy layers are then roughly crystallized into prisms, or their particles are aggregated into spheres composed of concentric layers of radiating crystals, as is often seen in agates.
"The second stratum was granite DISINTEGRATED; aqueous vapor, having been produced in such abundance as to be enabled to rise upward, partially disintegrating the crystals of felspar and mica, and superficially dissolving those of quartz. This mass would reconsolidate into granite, though of a smaller grain than the preceding rock.
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