mineral

Iron-rich slag or ironstone; appearance is not diagnostic

Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting slag

AI-generated identification · may be incorrect

Rough, dark gray to rusty brown, with a dull to weak metallic luster and irregular pits. Hardness and crystal structure cannot be reliably determined from the image.

Identified October 4, 2026More mineral →

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At a glance

Common name: Iron-rich slag or ironstone; appearance is not diagnostic
Scientific name: Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting slag
Category: mineral
Identified: October 4, 2026
Method: Standard

AI Estimated Value

About $1–$20 for a common unidentified specimen; typically more only with confirmed provenance or unusual features.

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

Rough, dark gray to rusty brown, with a dull to weak metallic luster and irregular pits. Hardness and crystal structure cannot be reliably determined from the image.

Formation & geological history

Could be natural iron-rich rock formed by geological concentration of iron oxides, or man-made smelting slag; the image alone cannot distinguish these origins or establish an age.

Uses & applications

Iron ores are used to produce iron and steel; slag is an industrial by-product and may be collected as a curiosity.

Geological facts

The porous, uneven texture can occur in slag, but weathered ironstone can look similar. A magnet test and examination of a fresh surface can help, though neither alone is definitive.

Field identification & locations

Check whether it is strongly magnetic and look for glassy, melted-looking areas or bubbles that suggest slag; iron oxides may leave a reddish-brown streak. Geological identification requires tests or context.