sedimentary

Sandstone (Pebble)

Arenite (primarily SiO2)

Hardness: 6-7 (Mohs); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Clastic (composed of mineral grains); Cleavage: None; Grains are medium-sized and sandy to the touch.

Hardness: 6-7 (Mohs)
Color: Tan, beige, grey
Luster: Dull/Earthy

Identified July 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Clastic (composed of mineral grains); Cleavage: None; Grains are medium-sized and sandy to the touch.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz. This rounded shape indicates high-energy transport in water, such as a riverbed or coastal environment.

Uses & applications

Commonly used as construction aggregate, decorative landscaping stone, and occasionally for sharpening tools in its rough form.

Geological facts

Sandstone acts as a natural aquifer, holding large amounts of water or oil in the pore spaces between sand grains. The rounded 'egg' shape is a result of millions of collisions during transport.

Field identification & locations

Common in the Pyrenees region (near 43.3°N, 1.2°E), where diverse sedimentary deposits from the Cenozoic and Mesozoic are found. Identify by its sandpaper-like texture and visible sand grains.