sedimentary

Sandstone Pebble

Arenite (SiO2 with various cementing agents)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, brownish-yellow, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic granular; Cleavage: None; Specific Gravity: 2.2-2.8.

Hardness: 6-7 (Mohs)
Color: Tan, brownish-yellow, or buff
Luster: Dull/Earthy

Identified June 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brownish-yellow, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic granular; Cleavage: None; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains (primarily quartz or feldspar) over millions of years. This specimen shows significant rounding typical of transport in water (fluvial or beach environments).

Uses & applications

Commonly used as construction aggregate, decorative landscaping stone, and in glass manufacturing if the quartz content is high. Small pebbles are often used in aquariums or garden paths.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks on Earth. Its porosity makes it one of the most important reservoir rocks for groundwater, petroleum, and natural gas.

Field identification & locations

Identify by the gritty sand-paper feel and visible grains under a hand lens. Commonly found in riverbeds, beaches, and sedimentary basins worldwide. This specimen is a water-worn clast.