sedimentary

Banded ironstone (likely jasper-rich ironstone)

Iron-rich chert/jasper with iron oxides, chiefly hematite and goethite; exact identification requires testing

AI-generated identification · may be incorrect

Rough, fine-grained specimen with reddish-brown and cream wavy bands and a dull to slightly earthy luster. Likely hardness about 5–7 Mohs; crystal structure is microcrystalline quartz if the pale and red bands are chert/jasper.

Identified September 26, 2026More sedimentary →

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At a glance

Common name: Banded ironstone (likely jasper-rich ironstone)
Scientific name: Iron-rich chert/jasper with iron oxides, chiefly hematite and goethite; exact identification requires testing
Category: sedimentary
Identified: September 26, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small, common rough specimen; more if it proves to be attractive lapidary jasper.

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

Iron-rich sediments were deposited and later compacted, with silica and iron oxides forming the contrasting bands. The specimen’s age and precise formation environment cannot be determined from the image alone.

Uses & applications

Ironstone may be used as iron ore; jasper-rich pieces are mainly collected or cut for decorative objects and jewelry.

Geological facts

Iron oxides create the characteristic red, brown, and ochre colors; banding may reflect changes in sediment composition or mineral deposition.

Field identification & locations

Look for a dense, fine-grained texture and naturally curved iron-rich bands; a steel scratch test and streak test can help distinguish jasper from softer earthy ironstone. Ironstone occurs in sedimentary formations worldwide.