sedimentary

Likely weathered iron-rich stone or concretion

Indeterminate; possibly ferruginous sandstone, ironstone, or a weathered sedimentary concretion

AI-generated identification · may be incorrect

Dark brown to gray, dull to weakly earthy luster, irregular granular surface, and apparently rounded/cobbly form. Hardness is estimated around 5–7 Mohs, but crystal structure, cleavage, and specific gravity cannot be determined reliably from this photograph.

Identified September 21, 2026More sedimentary →

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At a glance

Common name: Likely weathered iron-rich stone or concretion
Scientific name: Indeterminate; possibly ferruginous sandstone, ironstone, or a weathered sedimentary concretion
Category: sedimentary
Identified: September 21, 2026
Method: Standard

AI Estimated Value

$1–$10 for a common stone; potentially $20–$100+ if laboratory testing confirms an uncommon mineral or meteorite

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 formed by sediment cemented with iron oxides, or by groundwater concentrating iron into a concretion; age and precise environment are unknown. The rounded shape may result from natural abrasion or human shaping.

Uses & applications

Common material has little commercial value and may be used as aggregate or a decorative specimen; value is generally $1–$10 unless it proves to be an unusual mineral, fossil, or meteorite.

Geological facts

The reddish-brown coloration is consistent with hematite or goethite coatings, but the image does not show diagnostic crystals or metallic fusion features.

Field identification & locations

Test for a strong magnet response, streak on unglazed porcelain, hardness, and density; a reddish-brown streak suggests hematite, while a yellow-brown streak suggests goethite. Common possibilities occur widely in weathered soils, river gravels, and sedimentary formations; identification remains uncertain without a clearer image and tests.