sandstone


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sandstone,

sedimentary rockrock,
aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.
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 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 cemented with quartz are the hardest. Sandstones are commonly gray, buff, red, or brown although green and some other colors are also found. Green sandstones often contain, in addition to sand and glauconite, fossil shells and iron oxides; those that break apart easily are known as greensands and are sometimes used to replenish depleted potash in soils. Sandstones are widely used in construction and industry. Varieties of sandstone include arkose, which contains feldspar and resembles granitegranite,
coarse-grained igneous rock of even texture and light color, composed chiefly of quartz and feldspars. It usually contains small quantities of mica or hornblende, and minor accessory minerals may be present.
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, and graywacke, a gray or sometimes greenish or black rock composed of quartz and fledspar with numerous fragments of other rocks, such as shale, slate, quartzite, granite, and basalt. Sandstone may be crushed to the form of loose sand grains, which can then be put to the same industrial uses as sand. See brownstonebrownstone,
red to brown variety of sandstone. Its unusual color is caused in some instances by the presence of red iron oxide which acts as a cement, binding the sand grains together.
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sandstone

Sedimentary rock that is composed of sand-sized grains naturally cemented by mineral materials. See also: Stone

Sandstone

 

a sedimentary rock composed of sand grains cemented by clay, carbonate, siliceous, or other material. Like sand, sandstones are divided into small-grain (0.1–0.25 mm), medium-grain (0.25–0.5 mm), and large-grain (0.5 mm) varieties according to the predominant particle size. They are also divided mineralogically into monomineral and polymineral quartz sandstones, arkosic sandstones, and graywackes.

The density of sandstone is 2,250–2,670 kg per cu m; its porosity is 0.69–6.70 percent, and its water absorption, 0.63–6.0 percent. Sandstone with siliceous and carbonate cementing material has the best physicomechanical properties, and sandstone with clay cement, the poorest. The refractoriness of sandstone also differs, with the greatest heat resistance (up to 1,700°C) characteristic for pure quartz sandstone with siliceous cement. Sandstone is used in construction as wall and facing material and in rubble work. It is also used to make gravel for road building and concrete-making. Quartz sandstone with a SiO2 content of more than 95 percent is used in the production of Dinas brick, as a flux in smelting copper and nickel, and in manufacturing glass.

sandstone

[′san‚stōn]
(petrology)
A detrital sedimentary rock consisting of individual grains of sand-size particles 0.06 to 2 millimeters in diameter either set in a fine-grained matrix (silt or clay) or bonded by chemical cement.

sandstone

Sedimentary rock composed of sand-sized grains, naturally cemented by mineral materials. In most sandstone used for building, quartz grains predominate; often used for decorative elements in buildings because it is easy to carve.

sandstone

any of a group of common sedimentary rocks consisting of sand grains consolidated with such materials as quartz, haematite, and clay minerals: used widely in building
References in periodicals archive ?
Appraisal well 24/9-12 A encountered an oil column of about 30 metres in reservoir sandstone layers interpreted as being injectites in the Hordaland group with very to extremely good reservoir properties, as in the discovery well.
The detrital modes of sandstone of the Khojak Formation within the Pishin Belt were documented by Qayyum et al.
The rock crushed aggregate of limestone, sandstone and other hard rocks are also very common.
Swinerton Builders, EPC for the project, chose the company to offer engineering for Sandstone, which is owned by renewable energy IPP SPower.
Peter Sandstone mined from Ottawa, Illinois (Maslowski, 2012), is used as a standard by the American Society of Testing Materials (ASTM) (Zdunczyk, 2014).
The laboratory tests of the sandstone geomechanical parameters were conducted according to our own research procedures and those based on the ISRM recommendations (Ulusay and Hudson, 2007).
Another milestone for the route is the creation of the Sandstone Way website: www.
There are four types of sandstone paving known in the industry.
Geologist Jiff Bruthans of Charles University in Prague was touring a sandstone quarry when he noticed something odd: The workers had to use explosives to break apart the solid sandstone walls, but any rocks that had broken free would quickly crumble.
Also the sandstone has been left rough and isn't nice to touch or good to look at; before it was lovely and smooth to the touch.
Within the interval of the Lower Stairway Sandstone to the Middle Stairway Sandstone, fair to good oil shows were recorded in 25m of gross sand (23 m in the Lower Stairway Sandstone and 2 m in the Middle Stairway Sandstone).