mineral

Vesicular iron-rich slag or weathered metallic ore

Indeterminate; likely Fe-oxide-bearing slag (magnetite/hematite) rather than a specific natural mineral

AI-generated identification · may be incorrect

Dark brown to black, highly porous and irregular, with bright silvery metallic patches and dull earthy surfaces. Hardness is variable, commonly about 5–6 for iron oxides and glassy slag; crystal structure and cleavage are not discernible from the image.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

The vesicles and glossy metallic areas strongly suggest human-produced iron-smelting or forge slag, formed when molten silicate material cooled around gas bubbles; it is not assignable to a geological age without locality and testing.

Uses & applications

Usually a historical/industrial artifact or curiosity, with little commercial use; attractive pieces may be collected as archaeological or industrial slag specimens.

Geological facts

Magnetism, streak, density, and a fresh fracture are useful tests; iron-rich slag can resemble meteorites but typically has abundant bubbles and lacks a fusion crust.

Field identification & locations

Test with a strong magnet, inspect for flow texture and glass, and avoid assuming it is a meteorite. Natural iron ore commonly occurs in banded or massive seams, whereas this specimen’s vesicular texture favors slag.