sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, primarily SiO₂ grains cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Pale tan, rounded and water-worn, with a dull earthy luster and fine granular texture. Typical hardness is about 6–7 for quartz grains, though cement hardness varies; no obvious cleavage and likely low-to-moderate specific gravity (about 2.2–2.7).

Identified August 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented into sandstone, then eroded and rounded in a stream, beach, or glacial environment. Its exact geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and decorative landscaping material; this small pebble has mainly educational or modest collecting value.

Geological facts

The porous surface and iron-stained tan coloration are characteristic of weathered quartz-rich sandstone. Rounded edges indicate substantial transport or abrasion after lithification.

Field identification & locations

Look for visible sand grains, gritty texture, layering, and acid reaction if carbonate cement is present; a hand lens and streak/ hardness tests help distinguish it from limestone. Sandstone occurs worldwide in sedimentary basins and river or beach gravels.