sedimentary

Sandstone Pebble

Arenite (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, brown, or reddish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, brown, or reddish-brown
Luster: Dull/Earthy

Identified June 5, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, or reddish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years, typically in river beds, deserts, or marine environments. This specimen appears water-worn and rounded.

Uses & applications

Common sandstone is used in construction, road base materials, and as a component in glass manufacturing. Smooth pebbles are often used in landscaping and garden decor.

Geological facts

Sandstone makes up about 10-20% of the Earth's sedimentary rocks. Many famous canyons, such as the Grand Canyon, are composed of deep layers of ancient sandstone.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible grains. It is commonly found in riverbanks, beaches, and eroded sedimentary outcrops.