sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, likely arkosic or lithic sandstone

AI-generated identification · may be incorrect

Tan, fine- to medium-grained, earthy/matte surface with visible quartz or feldspar grains and iron-oxide staining; mostly quartz, feldspar, and rock fragments cemented by silica or calcite. Estimated Mohs hardness 6–7, with no obvious cleavage; granular texture and moderate porosity are typical.

Identified August 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a river, beach, dune, or shallow-marine environment, then rounded and weathered. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used as aggregate, building stone, and decorative landscaping material; this small piece has modest value as a common geological specimen.

Geological facts

The rough, granular texture and tan coloration distinguish sandstone from smoother limestone or crystalline igneous rocks. White patches may be quartz-rich cement, feldspar, or a small vein; an acid test could help detect calcite cement.

Field identification & locations

Common worldwide, especially in sedimentary basins and stream gravels. Look for visible sand grains, layering, and a gritty surface; typical collector value is about $1–$10, or up to $20 if unusually attractive or locality-labeled.