sedimentary

Weathered iron-rich concretion or lateritic pebble

Goethite/hematite-bearing ferruginous concretion; composition uncertain from image

AI-generated identification · may be incorrect

Brown, earthy, dull to slightly granular surface with no visible crystals or cleavage; likely Mohs hardness about 4–6 and relatively high density. The rounded, irregular form suggests abrasion or chemical weathering rather than a fresh crystal specimen.

Identified August 30, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich concretion or lateritic pebble
Scientific name: Goethite/hematite-bearing ferruginous concretion; composition uncertain from image
Category: sedimentary
Identified: August 30, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an unidentified common specimen; higher only if locality, unusual texture, or confirmed mineral identity adds collector interest.

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 iron-oxide cementation in soil, weathered bedrock, or sediment, commonly during prolonged tropical or humid-weathering conditions. Its precise age cannot be determined visually and may range from recent soil formation to ancient sedimentary deposits.

Uses & applications

Usually a low-value geological curiosity or teaching specimen; iron-rich material can be an ore indicator, but this piece is not visibly ore-grade. It has no typical jewelry or construction use.

Geological facts

Iron oxides commonly produce brown, red, yellow, and black coloration; goethite is yellow-brown to dark brown, while hematite is commonly red-brown to metallic gray.

Field identification & locations

Test streak on unglazed porcelain: yellow-brown suggests goethite/limonite, red-brown suggests hematite. A magnet test, hardness test, density measurement, and fresh broken surface would improve identification; common in soils, stream gravels, and weathered outcrops worldwide.