sedimentary
Sandstone
Clastic Sedimentary Rock
Hardness: 6-7 (depending on cementation), Color: Varies widely including tan, brown, yellow, red, grey, and white, Luster: Dull to earthy, Crystal Structure: Clastic or fragmental with quartz grains, Cleavage: None, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (depending on cementation), Color: Varies widely including tan, brown, yellow, red, grey, and white, Luster: Dull to earthy, Crystal Structure: Clastic or fragmental with quartz grains, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments, chiefly quartz and feldspar, ranging in size from 1/16 to 2 millimeters in diameter. Deposited in environments like deserts, rivers, and beaches over millions of years.
Uses & applications
Used extensively in construction as a building material, paving stone, and for making glass, concrete, and monuments.
Geological facts
Sandstone layers often act as excellent aquifers for storing groundwater and are frequent reservoirs for oil and natural gas.
Field identification & locations
Easily identified by its grainy texture resembling sandpaper and visible mineral grains. Found worldwide in regions with ancient sedimentary basins.
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Quartz pebble
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Generic Pebble / Rock Fragment
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Banded Siltstone / Mudstone Pebble
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