sedimentary

Weathered iron-stained stone, likely graywacke or altered sandstone

Indeterminate lithic fragment; probable quartz-rich sandstone/graywacke with iron-oxide staining

AI-generated identification · may be incorrect

Hardness approximately 6–7 where quartz-rich; dull to slightly earthy luster, gray-green to brown color, granular texture, and no obvious cleavage. Yellow-brown areas are likely limonite/goethite (hydrated iron oxides) filling fractures or weathered zones.

Identified August 28, 2026More sedimentary →

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At a glance

Common name: Weathered iron-stained stone, likely graywacke or altered sandstone
Scientific name: Indeterminate lithic fragment; probable quartz-rich sandstone/graywacke with iron-oxide staining
Category: sedimentary
Identified: August 28, 2026
Method: Standard

AI Estimated Value

Typically $0–$10 as an unidentified hand specimen; potentially more only with documented locality or unusual mineralization.

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

Likely deposited as sand or immature sediment, lithified by compaction and cementation, then fractured and weathered near the surface; exact age and formation environment cannot be determined from the photograph.

Uses & applications

Generally a common, non-gem-quality rock with little commercial value; suitable mainly for educational, decorative, or geological collecting purposes.

Geological facts

The rusty yellow-brown coloration commonly develops when iron-bearing minerals oxidize during weathering. Its rounded edges suggest stream, beach, or glacial transport rather than a freshly broken outcrop.

Field identification & locations

Look for gritty grains, quartz-rich hardness, and rusty staining; a streak, acid, and fresh-break examination would help distinguish sandstone from altered volcanic rock. Common worldwide, especially in sedimentary basins and gravel deposits.