"Silica" Quotes from Famous Books
 ... earth containing mostly alumina and silica or sand, that can be mixed with water, moulded into any shape, retain that shape after it is dry, and become hard by being burned. If you want to make a china cup, you must have a fine sort of clay called "kaolin," which is pure white when it is fired ...
— Diggers in the Earth • Eva March Tappan
... Shupanga the Mokundu-kundu tree abounds; its bright yellow wood makes good boat-masts, and yields a strong bitter medicine for fever; the Gunda-tree attains to an immense size; its timber is hard, rather cross-grained, with masses of silica deposited in its substance; the large canoes, capable of carrying three or four tons, are made of its wood. For permission to cut these trees, a Portuguese gentleman of Quillimane was paying the Zulus, in 1858, two hundred dollars a year, and his ...
— A Popular Account of Dr. Livingstone's Expedition to the Zambesi and Its Tributaries • David Livingstone
... what an unstable chemical compound man is. Here are the stage accessories as good as ever, while the players have all split up into hydrogen and oxygen and nitrogen and carbon, with traces of iron and silica and phosphorus. A tray full of chemicals and three buckets of water,—there is the raw material of my lady in the sedan chair! It's a curious double picture, if one could but conjure it up. On the one side, the high-born ...
— The Stark Munro Letters • J. Stark Munro
... for example, are formed by a combination of carbon, oxygen, and calcium. These are the so-called elements the union of which, in definite proportions, has resulted in the formation of chalk. The flints within the chalk we know to be a compound of oxygen and silicium, called silica; and our ordinary clay is, for the most part, formed by the union of silicium, oxygen, and the well-known light metal, aluminium. By far the greater portion of the earth's crust is compounded of the elementary substances mentioned in these ...
— Fragments of science, V. 1-2 • John Tyndall
... the Great War was essentially a series of explosive reactions resulting in the liberation of nitrogen. Nothing like it has been seen in any previous wars. The first battles were fought with cellulose, mostly in the form of clubs. The next were fought with silica, mostly in the form of flint arrowheads and spear-points. Then came the metals, bronze to begin with and later iron. The nitrogenous era in warfare began when Friar Roger Bacon or Friar Schwartz—whichever it was—ground together in his mortar saltpeter, ...
— Creative Chemistry - Descriptive of Recent Achievements in the Chemical Industries • Edwin E. Slosson
... common form of native silica. It is abundantly diffused throughout the world, and forms the common sand of the sea-shore. It occurs as veins or lodes in metamorphic rocks, and it is this form of its presence in Australia, associated with gold, that has made the word of such daily occurrence. ...
— A Dictionary of Austral English • Edward Morris
... alabastron, amphora, was produced, either transparent or of a single uniform tint, which might be white, blue, brown, green, &c., according to the particular oxide which had been thrown, with the silica and alkali, into the crucible. Generally, however, the manufacturer was not content with so simple a product: he aimed not merely at utility, but at beauty, and proceeded to adorn the work of his hands—whatever it was—with ...
— History of Phoenicia • George Rawlinson
... transformed into this fine product of human ingenuity. Esparto, a Spanish grass grown in South Africa, has entered largely into the making of print-paper in England. Mixed with rags it makes an excellent product, but the chemicals required to free it from resin and gritty silica are expensive, while the cost of importation has rendered its use in America impractical. Flax, hemp, manila, jute and straw, and of course old paper that has been once used, are extensively employed in this manufacture, the process beginning with ...
— A Book of Exposition • Homer Heath Nugent
... coal, bauxite, low-grade iron ore, calcium, natural asphalt, silica, mica, clays, ...
— The 2001 CIA World Factbook • United States. Central Intelligence Agency.
... spontaneously inflammable gas although it contained only traces of phosphine; its inflammability being caused by 2.1 per cent. of hydrogen silicide. Practically speaking, all the foregoing remarks made about phosphine apply equally to hydrogen silicide: it burns to solid silicon oxide (silica) at the burners, is insoluble in water, and is spontaneously inflammable when alone or only slightly diluted, but never occurs in good carbide in sufficient proportion to render the acetylene itself inflammable. According to Caro the silicon may be present both as hydrogen silicide and as ...
— Acetylene, The Principles Of Its Generation And Use • F. H. Leeds and W. J. Atkinson Butterfield
... a little hammer and chipping one of the stones by us to show me that it was a sandstone full of hard fragments of silica. "You might open a quarry anywhere here and cut millstones, but of course some of the stone is better for ...
— Patience Wins - War in the Works • George Manville Fenn
... Abstracts, 1889, p. 549), and it is stated that the resistance of glass to the action of water can generally be much increased by leaving it in contact with cold water for several days, and then heating it to 300 deg. to 400 deg. C. This improvement seems to be due to the formation of a layer of moist silica on the surface, and its subsequent condensation into a resisting layer by the heating. Mylius (C. S. J. Abstracts, 1892, p. 411), and Weber, and Sauer (C. S. J. Abstracts, 1892, p. 410) have also shown that the best glass for general chemical ...
— On Laboratory Arts • Richard Threlfall
... degrees 32 minutes South, Longitude 124 degrees 17 minutes East : Taken from rough range rising out of gently undulating desert. (July 5th.) : White flinty rock; consists in the main of Silica, with Magnesia and Alumina; it also contains water and traces of the Alkalies. It is probably derived from the decomposition of granite. The "rough ranges" are ...
— Explorations in Australia • John Forrest
... in an oven, or crucible, to expel the moisture and carbonic acid which it contains. They are then powdered to fine dust, which is placed in another crucible, and fused to liquid glass, the reha containing in itself sufficient silica to form the coarse glass used in making ...
— A Journey through the Kingdom of Oude, Volumes I & II • William Sleeman
... to more careful examination of the nascent states of silica, I have made no allusion in this volume to the influence of mere segregation, as connected with the crystalline power. It has only been recently, during the study of the breccias alluded to in page 186, that I have fully seen the extent to which this singular force often modifies ...
— The Ethics of the Dust • John Ruskin
... which all of the tissues of the body are composed are: carbon, oxygen, hydrogen, nitrogen, potassium, soda, lime, magnesia, iron, manganese, phosphor, sulphur, silica, ...
— Valere Aude - Dare to Be Healthy, Or, The Light of Physical Regeneration • Louis Dechmann
... glacial epoch, are very diverse, and it would be a thankless task to attempt any detailed classification on the basis of fertility. The soils of the Atlantic side being largely from the crystalline rocks and containing therefore much silica, are reputed less fertile than the gulf soils. The alluvial lands of the Mississippi and other rivers are beyond question the richest of all. Shaler says: "The delta districts of the Mississippi and its tributaries ...
— The Negro Farmer • Carl Kelsey
... process is the only hope of sufficiently moderate costs. A lead ore may be an amorphous compound with zinc, and successful concentration or smelting without great penalties may be precluded. A copper ore may carry a great excess of silica and be at the same time unconcentratable, and there may be no base mineral supply available for smelting mixture. The mine may be so small or so isolated that the cost of equipment will never be justified. Some of these conditions may be determined as ...
— Principles of Mining - Valuation, Organization and Administration • Herbert C. Hoover
... much. We have found, however, that a little marine wretch called the teredo attacks hemp so greedily that we've had to invent a new compound wherewith to coat it, namely, ground flint or silica, pitch, and tar, which gives the teredo the toothache, I suppose, for it turns him off effectually. We have also got an intermediate piece of cable to affix between the heavy shore-end and the light deep-sea portion. There are, of course, several improvements ...
— The Battery and the Boiler - Adventures in Laying of Submarine Electric Cables • R.M. Ballantyne
... skin from matter in a soluble state, similarly to the roots of trees. This process of absorption is probably accomplished in the interradial or ciliated chambers, more probably in the former, as the latter are generally considered excretory in function. Lime or silica must also be absorbed from the water by most sponges in order to make up the skeleton. The skeleton of calcareous sponges consists of a number of spicules composed of carbonate of lime. These spicules are ...
— Scientific American Supplement, No. 601, July 9, 1887 • Various
... polishing properties. 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. 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 ...
— How to See the British Museum in Four Visits • W. Blanchard Jerrold
... and even read papers at the local scientific societies. It is to be feared, however, that what Darwin would hear most of, as characteristic of the Huttonian teaching, would be assertions that chalk-flints were intrusions of molten silica, that fossil wood and other petrifactions had been impregnated with fused materials, that heat—but never water—was always the agent by which the induration and crystallisation of rock-materials (even siliceous conglomerate, limestone and ...
— Darwin and Modern Science • A.C. Seward and Others
... the series is the Gneis and Mica Slate System, of which examples are exposed to view in the Highlands of Scotland and the west of England. These earliest stratified rocks contain no matters which are not to be found in the primitive granite. They are the same in material—silica, mica, quartz, or hornblende—but changed into new forms and combinations, and hence called by Mr. LYELL metamorphic rocks. Some of them are composed exclusively of one of the materials of granite; the mica schist, for example, of mica; the quartz ...
— An Expository Outline of the "Vestiges of the Natural History of Creation" • Anonymous
... of International Packers, Ltd.; Vice President and Director of Swift & Company; member of the Board of Directors of Wedron Silica Co.) ...
— The Invisible Government • Dan Smoot
... exposed to continually moving water will lose about 0.20 gramme per square metre of surface per year. The mineral orthoclase, which enters largely into the constitution of many granites, was found to lose under the same conditions 0.025 gramme. A glassy lava (obsidian) rich in silica and in the chemical constituents of an average granite, was more resistant still; losing but 0.013 gramme per square metre per year. ...
— The Birth-Time of the World and Other Scientific Essays • J. (John) Joly
... everywhere the spiritual breaks through. Often in that nameless discouragement before unfinished tasks, unfulfilled aims, and broken efforts, I have thought of how the creative Word has fashioned the opal, made it of the same stuff as desert sands, mere silica—not a crystallized stone like a diamond, but rather a stone with a broken heart, traversed by hundreds of small fissures which let in the air, the breath, as the Spirit is called in the Greek of our New Testament; and through these two transparent mediums of such different density it is enabled ...
— The Power of Womanhood, or Mothers and Sons - A Book For Parents, And Those In Loco Parentis • Ellice Hopkins
... task of representing emotions by words—glories of color and form seen by the eye by symbols meant to be addressed to the ear. Before seeking to describe the diverse colors made largely by one substance, let us remember that while silica, the principal part of these water-built mounds, is one of the three parts of granite, namely, the white crystal quartz, it is also the substance of the beautifully variegated jasper, the lapis lazuli, the green ...
— Among the Forces • Henry White Warren
... looked black and fertile, and new-comers thought they were going to have good crops, but when these failed they found, upon examining the earth, that it was little more than black sand, and the particles of silica glittered if a handful were held in the sun. Such a sand would give the impression of dryness, instead of which it was extremely damp—damp ...
— Field and Hedgerow • Richard Jefferies
... the two men stepped out of the "testing shed"—the huge structure that housed their Osnomian-built space-cruiser, "Skylark II." Seaton waddled clumsily, wearing as he did a Crane vacuum-suit which, built of fur, canvas, metal and transparent silica, braced by steel netting and equipped with air-tanks and heaters, rendered its wearer independent of outside conditions of temperature and pressure. Outside this suit he wore a heavy harness of leather, buckled about his body, shoulders, and legs, attached to which were ...
— Skylark Three • Edward Elmer Smith
... 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 ...
— A Girl's Ride in Iceland • Ethel Brilliana Alec-Tweedie
... does not injure them. Mixtures may be very powerful, but they are erratic and require tight cases. In the United States we use dynamite for harbor mines. It is composed of seventy-five per cent. nitro-glycerine and twenty-five per cent. silica; but blasting gelatine and forcite gelatine will probably be adopted, when they can be satisfactorily manufactured here, as they are more powerful. The former is composed of ninety-two per cent. of nitro-glycerine and eight per cent. of gun-cotton, and the latter of ninety-five ...
— Scientific American Supplement, No. 794, March 21, 1891 • Various
... believe his own eyes: it was cement stone! Absolutely, undoubtedly, cement stone! How far did it extend? As far as he could see; it might even extend to the boundary of the estate. In any case, here was sufficient for extensive works for many, many years, if only there were enough silica with the clay and lime. He had soon knocked off a few pieces, which he put into the boat, and set out for home ...
— Absalom's Hair • Bjornstjerne Bjornson
... has its positive enclosed in an envelope. A very shallow porous tray (made of kaolin and silica) is filled with red lead paste, an electrode of rolled sheet lead is placed on its surface, and over this again is placed a second porous tray filled with paste. The whole then looks like a thin earthenware box ...
— Project Gutenberg Encyclopedia
... soluble in dilute hydrochloric acid, is (with the exception of the alumina it may contain) composed of fertilising material. The substances found in the soluble inorganic matter of soils are lime, magnesia, alumina, silica, phosphoric acid, oxide of iron, oxide of manganese, potash and soda. The insoluble mineral matter is nearly all silica. There is very little clayey matter in any of the soils—not more than about five per cent. All the soils are remarkably free from stones or pebbles, ...
— A start in life • C. F. Dowsett
... actors in the tragedy of Nature, which is here enacted, come upon the scene. Literally, they are the vents through which the steam and boiling water can escape. In doing so, however, the water, as at the Mammoth Springs, leaves a sediment of pure white lime or silica. Hence, from a distance, these basins look like desolate expanses of white sand. Beside them always flows a river which carries off the boiling water ...
— John L. Stoddard's Lectures, Vol. 10 (of 10) - Southern California; Grand Canon of the Colorado River; Yellowstone National Park • John L. Stoddard
... of 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 are the ...
— Round-about Rambles in Lands of Fact and Fancy • Frank Richard Stockton
... oxygen, and consequently native silicon is unknown—it is always found in combination with one or more other elements. When it bums, each atom of silicon unites with two atoms of oxygen to form a compound known to chemists as silica (SiO2), and to the small boy as "sand" ...
— The Working of Steel - Annealing, Heat Treating and Hardening of Carbon and Alloy Steel • Fred H. Colvin
... rises to upwards of a hundred and fifty feet into the air. The boiling water issues from conical mounds, with great noise. The whole ground around them is a mere crust, and when it is penetrated the boiling water is seen underneath. The Californian geysers, however, are impregnated, not with silica, like those of Iceland, but with sulphur, of which they form large deposits. The sulphurous vapours from the water corrode the rocks near the fountains; nevertheless trees grow, without injury to their health, at a distance from them of ...
— Wonders of Creation • Anonymous
... ferruginous sandy conglomerate. We now came to blocks of silicified wood lying on the surface; it is so like recent wood, that no one who has not handled it would conceive it to be stone and not wood: the outer surface preserves the grain or woody fibre, the inner is generally silica. ...
— The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume I (of 2), 1866-1868 • David Livingstone
... the naturalist left Mr. Haye and came to them, and presently was deep in quartz and silica, and onyx and chalcedony, and all manner of stones that are precious. He told all that Elizabeth wanted to know, and much more than she had dreamed of knowing. Even Rose listened; and Rufus was eagerly attentive; and Elizabeth after she had asked questions as far as ...
— Hills of the Shatemuc • Susan Warner
... intends to 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
... Ash Constituents.—It is frequently asserted that silica has a structural function sui generis in the plant skeleton, having a relationship to the cellulosic constituents of the plant, distinct from that of the inorganic ash components with which it is associated. ...
— Researches on Cellulose - 1895-1900 • C. F. Cross
... lapis lazuli represented it to be composed of silica, alumina, and soda, three colourless bodies, with sulphur and a trace of iron. Nothing could be discovered in it of the nature of a pigment, nothing to which its blue colour could be referred, the cause ...
— Familiar Letters of Chemistry • Justus Liebig
... workmanship must be employed throughout, and the fireclay materials must be literally of the very best and soundest description. Every single joint must be perfectly made with fireclay cement or paste. The fireclay bricks, &c., must be selected with regard to the amount of indestructible silica in the clay, consistent with hardness and toughness. Homogeneity of material must be obtained, having regard to expansion and contraction. The same material used for the bricks, &c., worked into a paste, must be employed ...
— The Turkish Bath - Its Design and Construction • Robert Owen Allsop
... be formed from any rock containing some form of combined silica (quartz). Thus, granites and crystalline rocks generally, volcanic rocks, and shales will produce clay if subjected to the proper climatic conditions. In the formation of clay, the extremely fine soil particles are attacked by the soil water and subjected to deep-going chemical changes. In fact, ...
— Dry-Farming • John A. Widtsoe
... coal, petroleum, natural gas, tin, limestone, iron ore, salt, clay, chalk, gypsum, lead, silica, arable land ...
— The 2000 CIA World Factbook • United States. Central Intelligence Agency.
... name of fusaioles has been given (Fig. 102), and of which we spoke in our account of the Lake Dwellings of Switzerland. These fusaioles are generally of common clay mixed with bits of mica, quartz, or silica, though some few have been found at Mykenae and Tiryns of steatite. The clay whorls before being baked were plunged into a bath of a very fine clay of gray, yellow, or black color, and then carefully polished. They nearly all bear ornaments of very primitive execution, ...
— Manners and Monuments of Prehistoric Peoples • The Marquis de Nadaillac
... by sterilization. R. Warington, J. T. Schloessing, C. A. Muentz and others had proved that nitrification was promoted by some organism, when Winogradsky hit on the happy idea of isolating the organism by using gelatinous silica, and so avoiding the difficulties which Warington had shown to exist with the organism in presence of organic nitrogen, owing to its refusal to nitrify on gelatine or other nitrogenous media. Winogradsky's investigations resulted in the discovery that two kinds of bacteria are concerned in ...
— Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 - "Baconthorpe" to "Bankruptcy" • Various |
