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Thus was gradually produced the formation of mica-schist, the mica imperfectly recrystallizing or being merely aggregated together in horizontal plates, between which the quartz either spread itself generally in minute grains or unified into crystalline nuclei.
Man observes the annual decomposition of crystalline and igneous rocks, and may sometimes see their conversion into stratified deposits; but he cannot witness the reconversion of the sedimentary into the crystalline by subterranean heat.
No water appeared until they had gone several miles. Then it was that they found themselves alongside a stream of crystalline clearness. It was not very broad nor swift, though quite deep. Standing on one shore, the bottom could be distinctly seen clean to the other side.
Again, we find that the red-coloured oxygen-seizing crystalline substance hæmoglobin exists in the blood of a vast number of animals, and might as well be green or colourless for all the good its colour does them. Yet here and there the splendid red colour which this chemical gives to the blood becomes of great importance as a "decoration," or "sex-ornament."
Here the crust was now made of layers to the depth of six or seven miles. In comparison with the massive crystalline rocks of Appalachia on the east, the layered rock of the trough was weak to resist lateral pressure, as a ream of sheets of paper is weak when compared with a solid board of the same thickness.
As Absalom sat listening to all this, his eyes were suddenly arrested by his wife's face half draped it was, half shadowed by her sun-bonnet, its fine and delicate profile distinctly outlined against the crystalline and frosted pane of the window near which she sat.
We must also mention amongst favorite ornaments beads made of jet and of very fine ochreous clay dried in the sun, of calcareous crystalline rock, and of grayish schist, and in other places of beads of amber or of hyaline quartz, the brightness of which attracted the attention.
I have those small cavities, in this rock, from the island of Arran, containing crystal, felt-spar, and mica, all crystallised in the same cavity . But this is nothing to the druzen or crystalline concretions, which are found in a similar manner among metallic and mineral substances in the veins and mines; there, every species of mineral and metallic substance, with every variety of mixture and composition, are found both concreted and crystallised together in every imaginable shape and situation.
The Cove will possibly be considered the only pleasant place in Portland. It is well wooded, of perfect outline, and with a miniature beach where shingle, rocks and greenery mingle in picturesque confusion and a remarkably crystalline sea laves the milk-white stones and gravel. Cave Hole, near by, is a fine sight in rough weather.
In mountains, a series of serrated peaks denotes the presence of dolomites; rounded heads mean calcareous rocks; and needles, crystalline schists. The preponderance of land in the northern hemisphere denotes the greater intensity there of the causes of elevation at a remote geologic epoch: that is all that one can say about it: but whence that greater intensity?
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