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Updated: June 13, 2025
It trends east and west, and you can find it easily by going past the base of Lambert's Dome to Dog Lake and thence up northward through the woods about a mile or so; to the shining rock-waves full of ice-burnished, feldspar crystals at the foot of the meadows; to Lake Tenaya; and, last but not least, a rather long and very hearty scramble down by the end of the meadow along the Tioga road toward Lake Tenaya to the crossing of Cathedral Creek, where you turn off and trace the creek down to its confluence with the Tuolumne.
These dikes are composed of green, white, and blackish rocks, all porphyritic with feldspar, and often with large crystals of hornblende. The white varieties approach closely in character to andesite, which composes as we have seen, the injected axes of so many of the lines of elevation. Some of the green varieties are finely laminated, parallel to the walls of the dikes.
Guadaloupe, an active volcano, the height of which, according to Leboucher, is 799 toises; according to Amie, 850 toises. Montserrat, a solfatara; fine porphyritic lavas with large crystals of feldspar and hornblende near Galloway, according to Mr. Nugent. Nevis, a solfatara. St. Christopher's, a solfatara at Mount Misery. St.
That celebrated chemist was of opinion that the rivers do not take up these oxides from the soil over which they flow, but that they derive them from their subterranean sources, and deposit them on the rocks in the manner of cementation, by the action of particular affinities, perhaps by that of the potash of the feldspar.
By-and-by the flow of life in the streets ebbs, and the old leafy inhabitants the smaller tribes always in front saunter in, one by one, very careless seemingly, but very tenacious, until they swarm so that the great stones gape from each other with the crowding of their roots, and the feldspar begins to be picked out of the granite to find them food.
In one spot on the western flank, and on the eastern flank near Los Manantiales and near the crest, I noticed some great masses of a whitish granite, parts of it fine- grained, and parts containing large crystals of feldspar; I neglected to collect specimens, so I do not know whether this feldspar is also orthitic, though I am inclined to think so from its general appearance.
Thus feldspar consists of the insoluble silicate of alumina, together with certain alkaline silicates which are broken up by the action of water containing carbon dioxide, forming alkaline carbonates. These carbonates are freely soluble and contribute potash and soda to soils and river waters.
Granite is made of quartz, mica, and feldspar, as has been said before. These three do not expand alike in heat; and therefore great flakes of the stone split off, so that it really seems to melt away. A well-made concrete is not affected by fire. It will not burn, and it will not carry heat to make other things burn.
The purest clay found in nature is porcelain clay, or kaolin, which results from the decomposition of a rock composed of feldspar and quartz, and it is almost always mixed with quartz. It always divides into laminae more or less regular.
Jutting knobs of feldspar and stunted shrubs growing from crevices offered toe-grips instead of the even foothold of the rock shelf. As Gordon looked down at the dizzy fall beneath them his judgment told him they had better go back. He said as much to his companion. The smile she flashed at him was delightfully provocative. It served to point the figure she borrowed from Gwen.
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