sedimentary

Weathered sandstone or quartz-rich sedimentary rock

Likely quartz arenite/subarkose; predominantly quartz (SiO₂) with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Tan-brown, fine- to medium-grained, dull earthy luster, and massive to weakly layered texture; individual grains are visible but cemented. Hardness is approximately 6–7 for quartz grains, though the rock may crumble along weathered surfaces; no obvious cleavage.

Identified August 25, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or quartz-rich sedimentary rock
Scientific name: Likely quartz arenite/subarkose; predominantly quartz (SiO₂) with feldspar and iron-oxide cement
Category: sedimentary
Identified: August 25, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for an ordinary hand specimen; distinctive, labeled, or attractive specimens may sell for $10–$30.

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—probably by silica, calcite, or iron oxides—then weathered at the surface; its age cannot be determined from the image. Common in terrestrial river, dune, beach, and shallow-marine sedimentary environments.

Uses & applications

Used as building stone, paving, aggregate, and occasionally decorative stone; this small weathered specimen has mainly educational or collecting value.

Geological facts

The rusty brown coloration commonly comes from oxidized iron minerals such as hematite or limonite. A streak or acid test can help distinguish quartz-rich sandstone from carbonate-rich rock.

Field identification & locations

Look for sand-sized grains, sedimentary layering, and weak reaction to dilute hydrochloric acid; a strong fizz would suggest calcite cement or limestone instead. Common worldwide, especially in sedimentary basins.