sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: Tan/Brown/Yellowish, Luster: Dull/Earthy, Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Tan/Brown/Yellowish, Luster: Dull/Earthy, Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or coastal environments over millions of years.
Uses & applications
Used extensively as a building material, decorative stone, for making grindstones, and in the production of glass.
Geological facts
Sandstone is highly porous and often acts as a natural aquifer or a reservoir for petroleum and natural gas.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible grains. Common in sedimentary basins and arid regions globally. Collectors look for unique banding or desert varnish.
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Sandstone
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