/sand"stohn'/, n.a common sedimentary rock consisting of sand, usually quartz, cemented together by various substances, as silica, calcium carbonate, iron oxide, or clay.[1660-70; SAND + STONE]
* * *Sedimentary rock formed from sand-sized grains (0.0025–0.08 in., or 0.06–2 mm, in diameter).The spaces between grains may be empty or filled with either a chemical cement of silica or calcium carbonate or a fine-grained matrix of silt and clay particles. The principal mineral constituents of the grain framework are quartz, feldspar, and rock fragments. Sandstones are quarried for use as building stone. Because of their abundance, diversity, and mineralogy, sandstones are also important to geologists as indicators of erosional and depositional processes. See also graywacke.
* * *▪ rocklithified accumulation of sand-sized grains (0.063 to 2 mm [0.0025 to 0.08 inch] in diameter). It is the second most common sedimentary rock after shale, constituting about 10 to 20 percent of the sedimentary rocks in the Earth's crust. Because of their abundance, diverse textures, and mineralogy, sandstones are important indicators of erosional and depositional processes.Texturally, sandstones consist of two components: (1) a framework composed of sand-sized grains and (2) interstitial volume between grains, which may be empty, especially in modern sandstones, or, in the case of most ancient sandstones, filled with either a chemical cement of silica or calcium carbonate or a fine-grained matrix.The principal mineral constituents of the framework are quartz, feldspar, and rock fragments. The relative proportions of these have genetic implications, first for the source area and second for the rate of deposition.Texture and mineralogical properties are used for sandstone classification, though considerable debate exists as to which properties to emphasize. The two major classes of sandstone are arenite and wacke. The boundary between the two is based on the amount of matrix present in the sample. Arenites contain less matrix than wacke. Though the exact boundary is debated, often 5 percent matrix is the accepted value, whereas some experts place this boundary at 15 percent. Another common classification uses the name arkose for rocks rich in feldspar. These names are further modified by the components present in the rock. Lithic arenite, feldspathic wacke, and quartz arenite are common examples.
* * *
См. также в других словарях:
Sandstone — is a sedimentary rock composed mainly of sand size mineral or rock grains. Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth s crust. Like sand, sandstone may be any color, but the most… … Wikipedia
Sandstone — Sand stone , n. A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand. [1913 Webster] Note: Different names are applied to the various kinds of sandstone according to their composition; as,… … The Collaborative International Dictionary of English
Sandstone — bezeichnet: Operation Sandstone, die dritte Serie US amerikanischer Kernwaffentests Sandstone (Minnesota), eine Stadt im Bundesstaat Minnesota in den Vereinigten Staaten Sandstone (Western Australia), eine Stadt im australischen Bundesstaat… … Deutsch Wikipedia
Sandstone — Sandstone, MN U.S. city in Minnesota Population (2000): 1549 Housing Units (2000): 634 Land area (2000): 5.296212 sq. miles (13.717125 sq. km) Water area (2000): 0.139947 sq. miles (0.362461 sq. km) Total area (2000): 5.436159 sq. miles… … StarDict's U.S. Gazetteer Places
Sandstone, MN — U.S. city in Minnesota Population (2000): 1549 Housing Units (2000): 634 Land area (2000): 5.296212 sq. miles (13.717125 sq. km) Water area (2000): 0.139947 sq. miles (0.362461 sq. km) Total area (2000): 5.436159 sq. miles (14.079586 sq. km) FIPS … StarDict's U.S. Gazetteer Places
sandstone — (n.) 1660s, from SAND (Cf. sand) (n.) + STONE (Cf. stone) (n.). So called from its composition … Etymology dictionary
sandstone — ► NOUN ▪ sedimentary rock consisting of sand or quartz grains cemented together, typically red, yellow, or brown in colour … English terms dictionary
sandstone — [sand′stōn΄] n. a common bedded sedimentary rock much used for building, composed largely of sand grains, mainly quartz, held together by silica, lime, etc … English World dictionary
sandstone — (Roget s IV) n. Varieties of sandstone include: arkrose, freestone, brownstone, flagstone, bluestone, grit, novaculite, Triassic brownstone, Berea sandstone, Medina sandstone, Potsdam quartzite, Old Red Sandstone, New Red Sandstone; see also… … English dictionary for students
sandstone — [[t]sæ̱ndstoʊn[/t]] sandstones N MASS Sandstone is a type of rock which contains a lot of sand. It is often used for building houses and walls. ...the reddish sandstone walls. ...sandstone cliffs … English dictionary