sedimentary

Weathered sandstone pebble

Sandstone, composed primarily of quartz and feldspar grains cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Tan-brown, dull to slightly earthy luster, visibly granular texture, and rounded water-worn form; hardness typically 6–7 for quartz grains, but the rock may crumble along cemented surfaces. No obvious cleavage; density commonly about 2.2–2.7 g/cm³.

Identified September 16, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone pebble
Scientific name: Sandstone, composed primarily of quartz and feldspar grains cemented by silica, calcite, or iron oxides
Category: sedimentary
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as an ordinary specimen; 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

Formation & geological history

Formed when sand accumulated, compacted, and cemented, then rounded by stream or shoreline transport and surface weathering. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used as building stone, paving, aggregate, and decorative rock; attractive pieces may be sold as display specimens, though this example appears common and low value.

Geological facts

The rusty coloration likely comes from iron-oxide staining, while darker patches may reflect clay, mica, or weathering. A hand lens should reveal individual sand grains and sorting.

Field identification & locations

Common in sedimentary terrains and riverbeds worldwide. Identify it by gritty grains, muted tan coloration, and lack of strong crystal faces; a streak, acid, and hardness test can help distinguish it from limestone or concretion.