sedimentary

Sandstone Pebble

Arenite (SiO2 based)

Hardness: 6.0-7.0 (Mohs scale); Color: Tan/Beige; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; Specific gravity: 2.3-2.6

Hardness: 6
Color: Tan/Beige
Luster: Dull/Earthy

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6.0-7.0 (Mohs scale); Color: Tan/Beige; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; Specific gravity: 2.3-2.6

Formation & geological history

Formed via the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years, often in environments like riverbeds, beaches, or deserts. This pebble has been water-worn and smoothed by alluvial action.

Uses & applications

Commonly used as construction aggregate, road base, landscaping decorative stone, and occasionally in glass manufacturing if the quartz content is high enough.

Geological facts

Sandstone is one of the most common sedimentary rocks on Earth. It is highly porous and often serves as a reservoir for groundwater or petroleum in underground formations.

Field identification & locations

Look for a gritty 'sandpaper' texture on non-polished surfaces. These are ubiquitous in riverbeds and glacial tills. Collectors can find them nearly anywhere there is moving water or ancient sedimentary basins.