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More "Silica" Quotes from Famous Books
 ... the Aluminates of Magnesia, including the sapphirine; the chrysoberyls from Brazil, and those inclosed in quartz and felspar with garnets. The next four cases (20-23) are loaded with the varieties of the Acid of Silicium or silica, which constitutes the greater part of hard stones and minerals with which the earth is encrusted. It is nearly pure in the rock crystal, of which there are many specimens in the first case (20), including those crystals called Bristol and Gibraltar ...
— How to See the British Museum in Four Visits • W. Blanchard Jerrold
... After the removal of this a qualitative analysis was made of the residual powder. Another gramme was also taken, without picking out the metallic iron, and was tested for chlorine and for phosphoric acid. The results of the qualitative analysis were that the stone contains silica, magnesia, a little alumina, oxide of iron and nickel, a little tin, an alloy of iron and nickel, phosphoric acid, and a trace of chlorine. These ingredients being determined, the plan for a quantitative analysis was laid out, and was ...
— Scientific American Supplement, No. 530, February 27, 1886 • Various
... leave the rocks bare; but usually they leave a residuum in which life strikes its roots. We do not see all that the waters take from the soil. They have invisible pockets in which they carry away all the more soluble parts, such as lime, soda, potash, silica, magnesia, and others, and leave for the land the more insoluble parts. These, too, in times of flood they carry away in suspension, in the shape of sand, silt, mud, gravel, and the like. When the waters really digest the rocks, they hold the various minerals in solution, and run limpid ...
— Time and Change • John Burroughs
... investigate the conditions under which living plants separate this substance from their tissues. That unicellular algae, like the Diatomaceae, living in a medium which may contain only one part in 10,000 by weight of dissolved silica, or even less than that amount, should be able to separate this substance to form their exquisitely ornamented frustules is one of the most striking facts in natural history, whether we regard it in its physiological or its ...
— Scientific American Supplement, No. 595, May 28, 1887 • Various
... refractive index 1.866! (which you will find set down in my table of refractive indices in my article "Light," Encyclopaedia Metropolitana). It was, however, too soft for optical use as an object- glass. This Faraday overcame, at least to a considerable degree, by the introduction of silica.' ...
— Faraday As A Discoverer • John Tyndall
... in a washing-basin on board a steamer, stood before us brimful of water just upon the simmer; while up into the air above our heads rose a great column of vapour, looking as if it was going to turn into the Fisherman's Genie. The ground about the brim was composed of layers of incrusted silica, like the outside of an oyster, sloping gently down on all sides from ...
— Letters From High Latitudes • The Marquess of Dufferin (Lord Dufferin)
... bricks were found to be only 1-1/2 inches thick, of a dark flinty appearance and as hard as iron, and seemed to be composed of silica and ...
— Picturesque Quebec • James MacPherson Le Moine
... the world to which you may chance to go you will find Silica. You may not know it by that name, but it is that shining, flinty substance you see in sand and rock-crystal. It is found in a very great number of things besides these two, but these ...
— Round-about Rambles in Lands of Fact and Fancy • Frank Richard Stockton
... two kinds of Geysers, one having jets of clear water, the other puffs of scalding vapour, coming up through a soft mud or clay of a reddish colour, probably from iron salts. In the water silica is held in solution by salts of soda, a silicate of soda being the chief ingredient. They are said to have great remediable powers; but, judging from the facility with which objects are encrusted by their silicates, it would seem as if their free use ...
— A Girl's Ride in Iceland • Ethel Brilliana Alec-Tweedie
... from the roots. Darwin says those rootlets behave as if they had minute brains in their extremities. They feel their way into the soil; they know the elements the plant wants; some select more lime, others more potash, others more magnesia. The wheat rootlets select more silica to make the stalk; the pea rootlets select more lime: the pea does not need the silica. The individuality of plants and trees in this respect is most remarkable. The cells of each seem to know what particular elements they want from the soil, as ...
— Under the Maples • John Burroughs
... dry summers along coast Terrain: geographically diverse; flat plains along Hungarian border, low mountains and highlands near Adriatic coast, coastline, and islands Natural resources: oil, some coal, bauxite, low-grade iron ore, calcium, natural asphalt, silica, mica, clays, salt, fruit, livestock Land use: 32% arable land; 20% permanent crops; 18% meadows and pastures; 15% forest and woodland; 9% other; includes 5% irrigated Environment: air pollution from metallurgical plants; ...
— The 1992 CIA World Factbook • United States. Central Intelligence Agency.
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