sedimentary

Likely weathered sandstone or iron-rich sedimentary rock

Quartz-rich sandstone, possibly ferruginous sandstone; exact identification requires testing

AI-generated identification · may be incorrect

Tan-brown, opaque, dull to earthy luster, apparently fine- to medium-grained with rusty iron staining and irregular fracture. Likely hardness about 6–7 if quartz-rich; no visible cleavage; specific gravity roughly 2.2–2.7.

Identified September 21, 2026More sedimentary →

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At a glance

Common name: Likely weathered sandstone or iron-rich sedimentary rock
Scientific name: Quartz-rich sandstone, possibly ferruginous sandstone; exact identification requires testing
Category: sedimentary
Identified: September 21, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 for an unremarkable fragment; perhaps $10–$30 if unusually colored or demonstrably from a notable locality.

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 by burial, compaction, and cementation of sand, with brown coloration from iron oxides; its geological age cannot be determined from the image. Weathering produced the rough, oxidized surface.

Uses & applications

Common sandstone is used as building stone, aggregate, paving, and abrasives; attractive pieces may be collected but are generally low-value.

Geological facts

The rusty orange-brown color commonly reflects hematite or goethite cement rather than a distinct mineral species.

Field identification & locations

Look for visible sand grains, gritty texture, and a quartz-rich composition; it should not fizz with dilute hydrochloric acid unless carbonate cement is present. Common in sedimentary terrains worldwide.