sedimentary

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone; exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Tan-brown, dull to earthy luster, granular texture, and irregular fracture; likely Mohs hardness about 6–7 for quartz grains but weakly cemented overall. Brown coloration may come from iron-oxide staining; no obvious crystal faces or cleavage are visible.

Identified August 11, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or iron-stained sedimentary rock
Scientific name: Likely quartz-rich sandstone; exact identification is uncertain from the photograph
Category: sedimentary
Identified: August 11, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an ordinary loose specimen; up to about $20–$50 if unusual, fossil-bearing, or attractively patterned.

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

Probably formed from compacted and cemented sand, commonly during the Paleozoic–Cenozoic eras, then altered by surface weathering. The rounded edges suggest natural erosion or handling.

Uses & applications

Common sandstone is used for building stone, paving, landscaping, and aggregate; ordinary specimens have little jewelry value. Attractive, well-cemented or fossiliferous pieces may interest collectors.

Geological facts

Sandstone can vary greatly in hardness depending on its cement—silica-cemented varieties are durable, while clay- or calcite-cemented varieties crumble more easily. The specimen may also be a weathered iron-rich concretion.

Field identification & locations

Look for visible sand grains, bedding, and a scratch response: quartz-rich grains can scratch glass, though the whole specimen may shed grains. Common worldwide, especially in sedimentary basins; acid testing and a fresh broken surface would improve identification.