clastic rock composed of grains from 0.0625 to 2 mm in diameter, usually quartz, feldspar, and rock fragments, bound together by a cement of quartz, carbonate, or other minerals, or by a matrix of clay minerals.
This is a sedimentary rock. The sandstone in the Knockan Crag area is known as Torridonian sandstones, named after the village of Torridon south of Ullapool, which is surrounded by mountains formed from this red rock. They are about 1000 million years old. Their red colour tells us that the rock was deposited on land not under the sea, as the iron minerals in the rock have â€˜rustedâ€™. They were deposited on top of the Lewisian gneiss by huge rivers which flowed across the landscape. At the time when these rocks were being deposited the land that we now call Scotland was near the South Pole.
a sedimentary rock made up of small pieces of rock, usually silicates such as quartz, that have been cemented together over time. Sandstone serves as the caprock on top of the limestone layer Mammoth Cave was formed in.
A sedimentary rock composed of individual grains of sand that are cemented together by silica, calcium carbonate, iron oxide and so forth. Sandstone is a common rock in which petroleum and water accumulate.
a sedimentary rock consisting predominantly of quartz grains between 2 mm and 1/16 mm in size which have been more or less cemented together by silica, iron oxides (limonite, hematite), calcite, and/or clay.
n: a sedimentary rock composed of individual mineral grains of rock fragments between 0.06 and 2 millimeters (0.002 and 0.079 inches) in diameter and cemented together by silica, calcite, iron oxide, and so forth.
A medium-grained sedimentary rock composed of abundant rounded or angular fragments of sand size set in a fine-grained matrix (silt or clay) and more or less firmly united by a cementing material (commonly silica, iron oxide, or calcium carbonate); the consolidated equivalent of sand, intermediate in texture between conglomerate and shale. The sand particles usually consist of quartz, and the term sandstone, when used without qualification, indicates a rock containing about 85-90% quartz (Krynine, 1940). The rock varies in color, may be deposited by water or wind, and contains numerous primary features (sedimentary structures and fossils). Sandstones may be classified according to composition of particles, mineralogic or textural maturity, fluidity index, diastrophism, primary structures, and type of cement (Klein, 1963). (b) A field term for any clastic rock containing individual particles that are visible to the unaided eye or slightly larger.
Sandstones usually can be identified by their coarse, granular, sandy texture. They are sedimentary rocks that consist of consolidated sand grains (mainly quartz and feldspar) cemented together with a variety of minerals (silicates, iron oxides, limonite, calcite and clays). These cementing materials make one sandstone behave very differently from another. Sandstones containing silica are quite hard, strong and decay resistant, whereas those containing calcite resemble limestone in their susceptibility to acid damage, and those containing clay absorb water and deteriorate more easily. Because they have a granular texture throughout, sandstone surfaces stay matte even when worked. Most sandstones have a tendency to absorb moisture and do not withstand frost action well, so they should not be used as foundation stones and should be protected from excessive moisture.
Sandstone is a sedimentary rock made of compacted sand, cemented with calcium, silicone of ferrous minerals. It varies in color based on the presence of other minerals. Sandstone is soft and easy to quarry and shape. Example: Las Vegas Sandstone
a sedimentary rock consisting usually of quartz, cemented with silica, iron oxide or calcium carbonate, Sandstone is durable, has a very high crushing and tensile strength and a wide range of colours and textures. Varieties of sandstone are commonly designated by the kind and prominence of interstitial and bonding material, as siliceous sandstone (bonding material primarily silica), calcareous sandstone (calcium carbonate prominent as bonding material or as accessory grains or both), sandstone (clay minerals prominent as interstitial or bonding materials, or as thin laminac ferruginous sandstone (iron oxide or hydroxide minerals (hematite,, limonite, et al) as interstitial or as boding materials in sufficient amount to impart appreciable colour of stone); brownstone (ferruginous sandstone of dark brown or reddish brown colour), arkose, arkosic sandstone, or feldspatic sandstone (a sandstone that contains an abundance of grains of feldspar), conglomerate a sandstone composed in large part of rounded pebbles, also called puddingstone). [Go to source
a sedimentary rock consisting usually of quartz, cemented with silica, iron oxide, or calcium carbonate. Sandstone is durable, has a high crushing and tensile strength and a wide range of colors and textures. This material is in high abundance in India.
the rock formed by the consolidation of sand, the grains being held together by a cement of silica, iron and other mineral salts; Type of salts, and number of wet/dry cycles, determines the colour and hardness of the deposit..
Formed by compacting sediments along old riverbeds or beaches. Sandstone lacks the calcium "cement" found in limestone, and thus does not dissolve to form multi-mile long caves. Instead, it erodes away, usually slumping down a mountain side forming traversable "cracks" no more than a few hundred feet long. See sandstone cave.
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 common colors are tan, brown, yellow, red, gray and white.