sedimentary
Sandstone
Sandstone (composed predominantly of SiO2)
Hardness 6-7 on Mohs scale, yellowish-brown to tan color, earthy to dull luster, granular texture, composed mainly of quartz and feldspar sand grains.
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Physical properties
Hardness 6-7 on Mohs scale, yellowish-brown to tan color, earthy to dull luster, granular texture, composed mainly of quartz and feldspar sand grains.
Formation & geological history
Formed by the compaction and cementation of mineral particles or rock fragments (sand) in terrestrial, riverbed, desert, or marine environments over millions of years.
Uses & applications
Widely used as a construction material, paving stone, building veneer, flagstone, and in landscape architecture.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. Its porosity allows it to act as an aquifer for groundwater or a reservoir for petroleum and natural gas.
Field identification & locations
Identified by its sandy feel, visible fine grains, and crumbly edges when broken. Commonly found in exposed cliff faces, canyons, riverbeds, and quarries globally.
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