sedimentary

Weathered sandstone pebble

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

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz grains; mustard-brown, dull to earthy luster, fine-grained and rounded from abrasion. No visible cleavage; porous sandstone texture may be concealed by weathering.

Identified August 26, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone pebble
Scientific name: Quartz-rich sandstone, typically dominated by SiO₂ grains cemented by silica, calcite, or iron oxides
Category: sedimentary
Identified: August 26, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 as an ordinary pebble; little collector value unless provenance, unusual texture, or fossil content is established.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Hardness about 6–7 for quartz grains; mustard-brown, dull to earthy luster, fine-grained and rounded from abrasion. No visible cleavage; porous sandstone texture may be concealed by weathering.

Formation & geological history

Formed when sand was compacted and cemented in ancient rivers, beaches, dunes, or shallow seas; its exact geological age cannot be determined from the photograph. Brown color commonly reflects iron-oxide staining and surface weathering.

Uses & applications

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

Geological facts

The smooth, asymmetric shape indicates transport and abrasion, likely in a stream, beach, or glacial deposit. A photograph cannot reliably distinguish sandstone from weathered iron-rich siltstone or quartzite.

Field identification & locations

Look for visible sand grains, gritty texture, layered bedding, and a streak that is usually white or pale; acid bubbling suggests carbonate cement. Common worldwide in sedimentary basins and gravel deposits.