mineral

Dark metallic mineral specimen, possibly hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing

AI-generated identification · may be incorrect

Small, dark gray-to-black, submetallic specimen with irregular crystal faces and possible reddish-brown streaking. Hematite has Mohs hardness 5–6.5 and red-brown streak; magnetite has hardness 5.5–6.5 and is strongly magnetic.

Identified August 29, 2026More mineral →

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At a glance

Common name: Dark metallic mineral specimen, possibly hematite or magnetite
Scientific name: Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing
Category: mineral
Identified: August 29, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a common small specimen; $10–$50 if it proves to be a well-formed or locality-labeled crystal.

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

Iron oxides form in hydrothermal veins, igneous rocks, metamorphic environments, and sedimentary iron formations over a wide range of geological ages. The image alone cannot establish its formation age or exact mineral identity.

Uses & applications

Used as iron ore, pigment, and a collector specimen; magnetite is also used in dense media and magnetic applications. This small rough piece has little jewelry value unless confirmed as an unusual crystal or meteorite.

Geological facts

A magnet test and streak test are highly diagnostic: magnetite attracts a strong magnet, while hematite leaves a brick-red streak and is usually weakly magnetic or nonmagnetic.

Field identification & locations

Common localities include banded iron formations worldwide, especially Australia, Brazil, India, and the United States. Test streak on unglazed porcelain and avoid relying on color alone; a laboratory hardness, density, or elemental test may be needed.