sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Fine- to medium-grained, reddish-brown stone with pale quartz-rich speckling and a dull, weathered luster; likely hardness about 6–7 where quartz grains dominate, with no visible cleavage. Rounded, smooth surfaces indicate abrasion or deliberate tumbling, and the irregular pale patches may be weathered cement or minera…

Identified August 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized quartz and rock fragments were compacted and cemented, probably by silica or iron oxides; its exact geological age and source cannot be determined from the photograph. Surface rounding likely occurred in a stream, beach, or tumbler.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and landscaping material; attractive pieces are collected or used as worry stones and decorative objects. Typical value is about $1–$10, or up to $20–$50 if unusually aesthetic or locally significant.

Geological facts

The reddish color commonly reflects hematite (iron oxide), while the pale grains are likely quartz. Sandstone can preserve sedimentary structures, fossils, or ancient environmental clues.

Field identification & locations

Identify it by visible sand grains, earthy red-brown coloration, lack of glassy crystal faces, and scratching glass only if quartz-rich. Common worldwide in sedimentary basins; a dilute acid test is usually negative unless carbonate cement is present.