sedimentary

Weathered iron-rich sandstone or ferruginous sedimentary rock

Quartz-rich sandstone, locally cemented by iron oxides (primarily hematite/goethite)

AI-generated identification · may be incorrect

Tan to reddish-brown, dull to earthy luster, highly weathered and pitted surface; likely Mohs hardness 5–7, with quartz grains and no obvious cleavage. Specific gravity is approximately 2.3–2.7, depending on iron content and porosity.

Identified September 7, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich sandstone or ferruginous sedimentary rock
Scientific name: Quartz-rich sandstone, locally cemented by iron oxides (primarily hematite/goethite)
Category: sedimentary
Identified: September 7, 2026
Method: Standard

AI Estimated Value

Typically $5–$30 as a common hand specimen; exceptional color, texture, or locality provenance may bring $50–$100.

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-sized quartz and rock fragments were deposited, compacted, and cemented, with later oxidation producing iron staining and weathering cavities. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used as building or landscaping stone and occasionally as a decorative specimen; generally little jewelry value unless unusually patterned or heavily mineralized.

Geological facts

The rusty coloration commonly reflects hematite or goethite cement. Surface pits may result from differential weathering of softer grains, clasts, or mineral-filled pores.

Field identification & locations

Common in continental sedimentary basins and iron-rich weathering zones worldwide. Look for visible sand grains, layered or granular texture, a gritty feel, and a lack of fizz with dilute hydrochloric acid; a streak test may reveal a reddish-brown streak.