sedimentary

Sandstone Pebble

Sedimentary Clastic Rock (Quartz Arenite)

Hardness: 6-7 on the Mohs scale (due to quartz grains); Color: Brown, tan, yellowish-brown; Luster: Dull to earthy; Crystal structure: Clastic/granular texture composed of cemented mineral particles or rock fragments; Cleavage: None (fractures irregularly); Specific gravity: 2.2-2.8

Hardness: 6-7 on the Mohs scale (due to quartz grains)
Color: Brown, tan, yellowish-brown
Luster: Dull to earthy

Identified August 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation, compaction, and cementation (lithification) of mineral particles or rock fragments, predominantly quartz sand grains, deposited by water, wind, or ice in environments like deserts, rivers, and beaches over millions of years.

Uses & applications

Used in construction, as dimension stone, in road aggregate, and historically as grindstones for sharpening tools.

Geological facts

Sandstone can preserve ancient ripple marks and dinosaur footprints, providing crucial clues about prehistoric environments.

Field identification & locations

Found worldwide in sedimentary basins, riverbeds, and coastal areas; easily identified by its gritty texture and visible sand grains.

Other sedimentary specimens

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Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Quartz pebble

Silicon dioxide (SiO2)

sedimentary

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

fossil

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

sedimentary

Sedimentary Sandstone

Arenite (Sedimentary Rock)

sedimentary

Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

sedimentary