sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
Hardness varies from 6 to 7 on the Mohs scale depending on the cement; color typically ranges from tan, brown, yellow, red, grey, to pink; luster is dull to earthy; crystal structure is clastic, composed mainly of quartz sand grains; cleavage is none.
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Physical properties
Hardness varies from 6 to 7 on the Mohs scale depending on the cement; color typically ranges from tan, brown, yellow, red, grey, to pink; luster is dull to earthy; crystal structure is clastic, composed mainly of quartz sand grains; cleavage is none.
Formation & geological history
Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments, chiefly quartz, typically deposited in environments like rivers, deserts, lakes, and beaches over millions of years.
Uses & applications
Widely used as a construction material for building, paving, and flagging, as well as in the manufacture of glass and abrasives.
Geological facts
Sandstone formations can be very porous, making them excellent aquifers for storing groundwater and natural gas.
Field identification & locations
Easily identified by its gritty texture, visible sand grains, and often distinct horizontal bedding layers. Found worldwide.
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Banded Siltstone / Mudstone Pebble
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