sedimentary

Sandstone (Water-worn Pebble)

Clastic Sedimentary Rock (primarily Quartz and Feldspar)

AI-generated identification · may be incorrect

Hardness: 6-7 (if quartz-dominated); Color: Tan, grey, or off-white; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (if quartz-dominated)
Color: Tan, grey, or off-white
Luster: Dull/Earthy

Identified July 20, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (if quartz-dominated); Color: Tan, grey, or off-white; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually in riverbeds, lakes, or oceans. This specific specimen has been rounded by mechanical erosion in a high-energy water environment.

Uses & applications

Common river stones are used for landscaping, construction aggregate, and as decorative features in gardens. Fine-grained sandstone is used as building stone.

Geological facts

Sandstone makes up about 10-20% of all sedimentary rocks on Earth. Its porosity makes it a major reservoir for groundwater and petroleum.

Field identification & locations

Identified by its sandy, gritty texture and the rounded shape indicating transport by water. It is found globally in riverbeds, beaches, and glacial deposits. Collectors value them as 'worry stones' or for rock painting.