sand


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sand,

rock material occurring in the form of loose, rounded or angular grains, varying in size from .06 mm to 2 mm in diameter, the particles being smaller than those of gravelgravel,
particles of rock, i.e., stones and pebbles, usually round in form and intermediate in size between sand grains and boulders. Gravel is composed of various kinds of rock, the most common constituent being the mineral quartz.
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 and larger than those of siltsilt,
predominantly quartz mineral particles that are between sand size and clay size, i.e., between 1-16 and 1-256 mm ( 1-406 – 1-6502 in.) in diameter. Silt, like clay and sand, is a product of the weathering and decomposition of preexisting rock.
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 or clayclay,
common name for a number of fine-grained, earthy materials that become plastic when wet. Chemically, clays are hydrous aluminum silicates, ordinarily containing impurities, e.g., potassium, sodium, calcium, magnesium, or iron, in small amounts.
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. Sand is formed as a result of the weatheringweathering,
collective term for the processes by which rock at or near the earth's surface is disintegrated and decomposed by the action of atmospheric agents, water, and living things. Some of these processes are mechanical, e.g.
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 and decomposition of igneous, sedimentary, or metamorphic rocks. Its most abundant mineral constituent is silica, usually in the form of quartzquartz,
one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2.
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, and many deposits are composed almost exclusively of quartz grains. Many other minerals, however, are often present in small quantities, e.g., the amphiboles, the pyroxenes, olivine, glauconite, clay, the feldspars, the micas, iron compounds, zircon, garnet, tourmaline, titanite, corundum, and topaz. Some sands—e.g., coral sands, shell sands, and foraminiferal sands—are organic in origin. Sand grains may be rounded or more or less angular, and differences in shape and size account chiefly for differences in such important properties as porosity (proportion of interstices to the total mass), permeability to gases and liquids, and viscosity, or resistance to flow. Permeability and viscosity are also affected by the proportion of clayey matter present. The chief agents in accumulating sands into deposits are winds, rivers, waves, and glaciers; sand deposits are classified according to origin as fluviatile, lacustrine, glacial, marine, and eolian. The most extensive superficial deposits are seen in the desertdesert,
arid region, usually partly covered by sand, having scanty vegetation or sometimes almost none, and capable of supporting only a limited and specially adapted animal population.
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 and on beaches. The surface of a sand deposit may be level or very gently sloping, or the sand may be gathered by wind action into ridges called dunes. Sandstonesandstone,
sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone varies according to the character of the cementing material; quartz sandstones
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 and quartzitequartzite,
usually metamorphic rock composed of firmly cemented quartz grains. Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green, purple, or black by included minerals. It results from the metamorphism of pure quartz sandstone.
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 rocks are indurated masses of sand, and sand deposits are sometimes formed by the weathering of sandstone and quartzite formations. Sand is used extensively in the manufacture of bricks, mortar, cement, concrete, plasters, paving materials, and refractory materials. It is also used in the metallurgical industry, in the filtration of water, in pottery making, in glassmaking, in the manufacture of explosives, and as an abrasive. Other industrial uses are numerous. Although soils entirely composed of sand are too dry and too lacking in nourishment for the growth of plants, a soil that is to some extent sandy (a "light" soil) is favorable to certain types of agriculture and horticulture, as it permits the free movement of air in the soil, offers less resistance than a clay soil to growing roots, improves drainage, and increases ease of cultivation. Sand to which nutrient solutions have been added is often used in soilless gardening.

Sand

 

small fragments of loose sedimentary rock or contemporary sediment. Sand consists of round and angular grains of various minerals and rock fragments ranging from 0.1 to 1 mm (from 0.05 to 2 mm or larger, according to other classifications). It also has admixtures of silt (aleurite) and clay particles.

Sand may be designated by its origin as river, lake, sea, fluvioglacial, or eolian sand. In terms of mineralogical composition the most common sands are quartz, glauconite-quartz, feldspar-quartz, and mica sands. Sand may contain valuable minerals— gold, platinum, diamonds, sapphires, rubies, zircon, rutile, sphene, and ilmenite—some of which are extracted. Both natural sand and man-made sand, produced by crushing rock, are used in construction and in the building-materials industry. Quartz sand is used as a raw material in making glass, as a component in manufacturing porcelain, earthenware, and construction ceramics, and as material for making casting molds. The quality of sand is determined by the size of its grains, its mineralogical composition, and the amount of impurities.

Sorted sand must have a strictly regulated grain composition. Natural sand is usually supplied in two grades: large (5–0.63 and 5–1.25 mm) and small (1.25–0.14 and 0.63–0.14 mm). Impurities may not exceed 2 percent. There are two grades of crushed sand, 800 and 400, depending on the strength of the original rock.

REFERENCES

Fadeev, P. I. Peski SSSR, part 1. Moscow, 1951.
Trebovaniia promyshlennosti k kachestvu mineral’nogo syr’ia, 2nd ed., issues 2, 29, 74. Moscow, 1959–63.
Grauvakki. Moscow, 1972.

What does it mean when you dream about sand?

A dream about sand might relate to pleasant memories of being at the beach. Alternatively, sand can represent time—as in “the sands of time”—or the insecurity of building one’s house in the sand. Sand is also associated with deserts and the lack of nourishing water. (See also Beach, Desert).

sand

[sand]
(geology)
Unconsolidated granular material consisting of mineral, rock, or biological fragments between 63 micrometers and 2 millimeters in diameter, usually produced primarily by the chemical or mechanical breakdown of older source rocks, but may also be formed by the direct chemical precipitation of mineral grains or by biological processes.

sand

1. Granular material which passes through a 9.51-µ (?-in.) sieve, almost entirely passes through a 4.76-mm (No. 4) sieve, and is predominantly retained on a 74-µ (No. 200) sieve; results from natural disintegration and abrasion of rock or processing of completely friable sandstone.
2. That portion of an aggregate passing through a 4.76-mm (No. 4) sieve and predominantly retained on a 74-µ (No. 200) sieve. Also see sieve number.

sand

1. loose material consisting of rock or mineral grains, esp rounded grains of quartz, between 0.05 and 2 mm in diameter
2. a sandy area, esp on the seashore or in a desert
3. a greyish-yellow colour

Sand

George , pen name of Amandine Aurore Lucie Dupin. 1804--76, French novelist, best known for such pastoral novels as La Mare au diable (1846) and François le Champi (1847--48) and for her works for women's rights to independence
References in classic literature ?
Most of the soil had been washed away or buried in drift after the removal of the trees; only where the streamlet ran down from the kettle a thick bed of moss and some ferns and little creeping bushes were still green among the sand.
One can imagine them, covered with sand, excited and disordered, running up the little street in the bright sunlight just as the shop folks were taking down their shutters and people were opening their bedroom windows.
As the sand is being poured into the well-hole, quantities of dynamite can also be thrown in
One summer afternoon, when I had promised to go shrimping along the sands with Philip, I was waiting rather impatiently in the front drawing-room, watching Arthur handle some packets of coins he had just purchased and slowly shunt them, one or two at a time, into his own dark study and museum which was at the back of the house.
Scanty grass took the place of the fine trees of the east; only a few belts of half-scorched herbage still contended against the invasion of the sand, and the huge rocks, that had rolled down from the distant summits, crushed in their fall, had scattered in sharp-edged pebbles which soon again became coarse sand, and finally impalpable dust.
The karoo bushes caught our feet and retarded us, and the sand worked into our veldtschoons and Good's shooting-boots, so that every few miles we had to stop and empty them; but still the night kept fairly cool, though the atmosphere was thick and heavy, giving a sort of creamy feel to the air, and we made fair progress.
In attempting to lift it from its burying place I dis-covered that it seemed to be held fast by means of a very small insulated cable running farther into the sand beneath it.
And so they moved to the side of the gorge beneath the shade of an overhanging rock and lay down in the hot sand to rest.
He paused and considered the matter, while Jerry returned to digging the sand where the scent was auspicious.
And I saw it go under the sand, a fathom under the sand, on cross-bearings unnamable, where the mangroves fade away, and the coconuts grow, and the rise of land lifts from the beach to the Lion's Head.
The tropic rain sheeted about them so that they could see only the beach under their feet and the spiteful little waves from the lagoon that snapped and bit at the sand.
The wind will blow you swiftly across the desert and the sand cannot touch your flesh to turn it into dust.