sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, composition and exact type uncertain from the image

AI-generated identification · may be incorrect

Tan, rounded, dull and visibly granular; likely mostly quartz with minor feldspar and iron-oxide staining. Quartz is Mohs 7, but the rock’s overall hardness and specific gravity depend on cement and grain composition; no obvious cleavage or crystals are visible.

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Sand grains were deposited and cemented into sandstone, then weathered and rounded during transport. Its geological age cannot be determined from appearance alone.

Uses & applications

Commonly used as building and paving stone; this small pebble is chiefly suitable for collecting or decoration.

Geological facts

Sandstone is identified by sand-sized grains, often visible with a hand lens; iron oxides commonly give it yellow, tan, or rusty colors.

Field identification & locations

Look for a gritty texture and individual grains; a quartz-rich sample resists scratching by a steel knife. Sandstone occurs worldwide in sedimentary basins, river deposits, and beaches.