sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 (Mohs scale), Color: Tan, beige, or yellowish-brown, Luster: Dull/Earthy, Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8

Identified June 17, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Tan, beige, or yellowish-brown, Luster: Dull/Earthy, Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments of sand size (0.0625 to 2 mm). Often found in desert, river, or coastal environments over millions of years.

Uses & applications

Used widely in construction as a building material, for paving stones, in glass manufacturing (if high silica content), and as an artistic medium for sculpture.

Geological facts

Sandstone can preserve fossilized footprints from ancient creatures and ripple marks from prehistoric sea beds. It is also an important reservoir for groundwater and oil due to its porosity.

Field identification & locations

Identified by its gritty 'sandpaper' feel and visible layers or grains. Commonly found in canyons, beaches, and sedimentary basins. For collectors, look for unique patterns like 'wonderstone' or fossil inclusions.