sedimentary

Iron-rich rock fragment (likely hematite/goethite-rich ironstone)

Ironstone, composed chiefly of iron oxides/hydroxides such as hematite (Fe₂O₃) and goethite (FeO(OH)); exact identification requires testing

AI-generated identification · may be incorrect

Opaque, dark brown to rusty brown with earthy to subdued metallic luster; uneven fracture and no obvious crystal faces. Hardness and specific gravity cannot be reliably determined from the image; hematite is Mohs 5–6.5, goethite about 5–5.5.

Identified October 3, 2026More sedimentary →

Explore Iron-rich rock fragment (likely hematite/goethite-rich ironstone) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Iron-rich rock fragment (likely hematite/goethite-rich ironstone)
Scientific name: Ironstone, composed chiefly of iron oxides/hydroxides such as hematite (Fe₂O₃) and goethite (FeO(OH)); exact identification requires testing
Category: sedimentary
Identified: October 3, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common hand-sized fragment; higher value would require unusual form, locality, or verified composition.

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 accumulation and cementation in sediment, or by weathering of iron-bearing material. Ironstone forms in varied settings and ages; the specimen’s age and precise origin are unknown.

Uses & applications

Iron-rich material can be an iron ore when sufficiently concentrated; small fragments are mainly geological or educational collectibles, not typically used as gemstones.

Geological facts

Hematite leaves a reddish-brown streak, while goethite commonly gives a yellowish-brown streak—useful clues when identifying iron-rich specimens.

Field identification & locations

The rusty color and dense-looking, brown surface suggest ironstone, but appearance alone cannot distinguish it from other iron-rich rocks. Common in sedimentary deposits and weathered outcrops; a streak test and density measurement can help identify it.