sedimentary
Sandstone
Arenite (SiO2 based)
Hardness: 6-7 (Mohs scale), Color: tan, grey, or brownish, Luster: dull to earthy, Crystal structure: clastic texture with sand-sized grains, Cleavage: none, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, grey, or brownish, Luster: dull to earthy, Crystal structure: clastic texture with sand-sized grains, Cleavage: none, Specific gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments, typically in riverbeds, deltas, or beaches over millions of years (Phanerozoic eon)
Uses & applications
Widely used in the construction industry as building material, road base, abrasive, and in glass manufacturing if the quartz content is high
Geological facts
Sandstone is highly porous and often acts as a natural aquifer or a reservoir for petroleum and natural gas
Field identification & locations
Identified in the field by its distinct gritty feel like sandpaper; common in sedimentary basins worldwide; check for bedding planes or layers
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