igneous

Weathered iron-rich rock, likely hematite–goethite-bearing basalt or ironstone

Basalt/ironstone matrix with hematite (Fe₂O₃), goethite [FeO(OH)], and possibly limonite

AI-generated identification · may be incorrect

Dark gray, rusty orange-brown, and cream patches; dull to earthy luster, fine-grained and strongly weathered, with irregular fracture and no visible crystals. Approximate hardness 5–6 for the silicate matrix; iron oxides range from about 1–6.5 Mohs.

Identified September 18, 2026More igneous →

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At a glance

Common name: Weathered iron-rich rock, likely hematite–goethite-bearing basalt or ironstone
Scientific name: Basalt/ironstone matrix with hematite (Fe₂O₃), goethite [FeO(OH)], and possibly limonite
Category: igneous
Identified: September 18, 2026
Method: Standard

AI Estimated Value

Typically $5–$25 for an ordinary specimen; approximately $25–$100 if unusually aesthetic, dense, or locality-documented.

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 volcanic basalt or another mafic rock altered by oxygen-rich groundwater, producing iron-oxide staining and coatings; exact age and locality cannot be determined from the image.

Uses & applications

Common material has little commercial value, though ironstone may be used as low-grade iron ore, aggregate, or a lapidary specimen; attractive pieces can be collected decoratively.

Geological facts

The orange-red coloration reflects oxidized iron, commonly called rust. A reddish-brown streak and attraction to a strong magnet would help distinguish iron-rich basalt from nearly pure hematite or goethite.

Field identification & locations

Look for a dense, dark matrix with rusty coatings, earthy fracture surfaces, and possible magnetic response; field identification should include streak, magnetism, hardness, and a fresh broken surface. Common in weathering zones, basalt terrains, and iron-rich sedimentary deposits.