mineral

Iron-rich mineral specimen, possibly magnetite-rich ore

Possibly magnetite (Fe₃O₄), with associated iron oxides; identification is uncertain from the photograph

AI-generated identification · may be incorrect

Dark gray to black, uneven granular surface with a metallic-to-submetallic shine. Magnetite has Mohs hardness 5.5–6.5, cubic crystal structure, no cleavage, and specific gravity around 5.2; this specimen’s texture and weight cannot be confirmed visually.

Identified October 8, 2026More mineral →

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At a glance

Common name: Iron-rich mineral specimen, possibly magnetite-rich ore
Scientific name: Possibly magnetite (Fe₃O₄), with associated iron oxides; identification is uncertain from the photograph
Category: mineral
Identified: October 8, 2026
Method: Standard

AI Estimated Value

About $2–$20 for a common rough hand specimen; more only if its identity, locality, or unusual features are 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

Magnetite forms in igneous and metamorphic rocks, hydrothermal veins, and sedimentary iron deposits; its age depends on the deposit. The specimen may be an iron ore or iron-rich aggregate, but the image alone cannot establish its origin.

Uses & applications

Magnetite is an important iron ore and is also used in dense concrete and mineral collections. This rough specimen has no evident gem or decorative use.

Geological facts

Magnetite is naturally magnetic and commonly leaves a black streak. Other dark, shiny iron ores and industrial slag can look similar.

Field identification & locations

Check whether it attracts a magnet and leaves a black streak on unglazed porcelain; confirm with density and mineral tests, since appearance alone is not diagnostic. Magnetite occurs worldwide, including major deposits in Australia, Brazil, Sweden, and the United States.