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Updated: June 20, 2025
The second division for the study of this class of rocks is in charge of Prof. Roland D. Irving, with a corps of geologists, and his field of operation is in the Lake Superior region. It is not proposed at present to undertake the study of the crystalline schists of the Rocky Mountain region.
Nature taught her children through the working of the laws of gravitation how to build so that her forces should act in harmony with art, to preserve the integrity of a structure meant to reach a far-off posterity. The pyramid is only the cone in which Nature arranges her heaped and sliding fragments; the cone with flattened Surfaces, as it is prefigured in certain well-known crystalline forms.
After all, not to labor only, But to breathe in the essence of vivified sheen, The fragrance of rarefied thoughts as they surge to and fro, Heaving the unknown depths up to mountains of night. Crystalline, luminous, rare, opalescently rare, This, this is June! "Ah, blank verse," said Sibyl to her companion, with admiring interest. He bowed and stroked his moustache with a dreamy air.
It is rotting the heart out of the Tenderloin. Did you notice Veronica Haversham's yellowish whiteness, her down-drawn mouth, elevated eyebrows, and contracted eyes? She may have taken it up to escape other drugs. Some people have and have just got a new habit. It can be taken hypodermically, or in a tablet, or by powdering the tablet to a white crystalline powder and snuffing up the nose.
Round two little cavities, in a specimen of this variety, I found the black specks aggregated into minute crystals, appearing like those of augite or hornblende, but too dull and small to be measured by the goniometer; in the specimen, also, I could distinguish amidst the crystalline feldspar, grains, which had the aspect of quartz.
Carbonate of lime, if crystallised at ordinary temperatures, possesses the crystalline form, hardness, and refracting power of common spar; if crystallised at a higher temperature, it has the form and properties of arragonite.
Paul de Fenouillet, the chalky limestone becomes more crystalline and saccharoid as it approaches the granite, and loses all trace of the fossils which it previously contained in abundance. At some points, also, it becomes dolomitic, and filled with small veins of carbonate of iron, and spots of red iron-ore.
Mary turned her face away, her eyes growing dim with tears of mingled pain and happiness; for how long it had taken her to read the soul that was so easy to read, so crystalline, and how much it would have helped her if she could have understood it sooner!
The members of both these divisions of rocks agree in being highly crystalline and destitute of organic remains. The rocks of one division have been called Plutonic, comprehending all the granites and certain porphyries, which are nearly allied in some of their characters to volcanic formations.
This 'nickel-iron, as it is commonly called, is usually crystalline in texture, and when it is cut, polished, and 'etched' a beautiful net-work of lines is brought out, indicating plates which lie in positions determined by the crystalline character of the mass. This net-work of lines constitutes what are called the Widmannstattian figures, from the name of their discoverer.
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