sedimentary

Likely weathered iron-rich concretion or jasper

Goethite/hematite-bearing chert or ferruginous concretion (identification uncertain from photograph)

AI-generated identification · may be incorrect

Brown to reddish-brown, dull-to-waxy luster, granular and strongly weathered surface; likely hardness about 5–7 Mohs, with no obvious cleavage. The rounded shape may reflect natural concretion formation or tumbling.

Identified August 14, 2026More sedimentary →

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At a glance

Common name: Likely weathered iron-rich concretion or jasper
Scientific name: Goethite/hematite-bearing chert or ferruginous concretion (identification uncertain from photograph)
Category: sedimentary
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $1–$10 as common rough material; $10–$30 if it proves to be attractive jasper or a distinctive mineral specimen.

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 by silica and iron-oxide cementation in sedimentary rock, followed by weathering and erosion; its precise age and setting cannot be determined visually. It may also be a piece of iron-rich jasper/chert.

Uses & applications

Common material has modest value as a curiosity, lapidary rough, or educational specimen; jasper may be polished for cabochons and carvings. It has no major industrial use in this small form.

Geological facts

Iron oxides produce the red-brown coloration, while goethite or hematite may create darker areas. A streak test and hardness test would substantially improve identification.

Field identification & locations

Common in weathered sedimentary terrains, ironstone beds, and gravel deposits worldwide. Check whether it scratches glass, leaves a red-brown streak, or attracts a magnet; avoid destructive testing on valuable specimens.