sedimentary

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Tan, beige, or brownish-grey; Luster: Dull or earthy; Crystal structure: Granular/clastic; Cleavage: None; Specific gravity: 2.2-2.8. Smooth, rounded texture due to water erosion.

Hardness: 6-7 Mohs
Color: Tan, beige, or brownish-grey
Luster: Dull or earthy

Identified March 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the compaction and cementation of sand-sized mineral grains or rock fragments over millions of years. This specific specimen has been further shaped by fluvial or coastal wave action (mechanical weathering), typical of the Cenozoic era or older formations depending on the local coastline.

Uses & applications

Common pebbles are used as aquarium substrate, decorative landscaping, and occasionally in the construction of terrazzo floors or as aggregate. Large-scale sandstone is used in masonry and architecture.

Geological facts

Sandstone contains a record of the past environment, such as ancient riverbeds or dunes. Some sandstone beach pebbles can contain micro-fossils or mineral inclusions like iron oxides which give them their reddish-brown tint.

Field identification & locations

Identified in the field by its gritty texture (if broken) and visible sand grains. It is often found on high-energy beaches or riverbanks. Collectors value them for 'pocket stones' or rock tumbling due to their durability.