mineral

Possible hematite-rich ironstone or magnetite-bearing specimen

Likely hematite (Fe₂O₃), magnetite (Fe₃O₄), or an iron-rich slag-like geological specimen

AI-generated identification · may be incorrect

Black to dark gray, strongly metallic to submetallic luster, irregular botryoidal/rough surface, and massive structure. Hematite has Mohs hardness 5–6.5 and reddish-brown streak; magnetite has hardness 5.5–6.5 and a black streak, and is magnetic.

Identified September 4, 2026More mineral →

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At a glance

Common name: Possible hematite-rich ironstone or magnetite-bearing specimen
Scientific name: Likely hematite (Fe₂O₃), magnetite (Fe₃O₄), or an iron-rich slag-like geological specimen
Category: mineral
Identified: September 4, 2026
Method: Standard

AI Estimated Value

$5–$30 for a common specimen; $30–$100+ if strongly magnetic, botryoidal, unusually aesthetic, 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

Iron oxides form through hydrothermal alteration, weathering, or precipitation in sedimentary iron deposits; magnetite commonly crystallizes in igneous and metamorphic environments. Age depends on locality and cannot be determined photographically.

Uses & applications

Used as an iron ore, pigment, polishing abrasive, and collector specimen; attractive polished pieces may be decorative. A magnet and streak test are needed to distinguish it from industrial slag.

Geological facts

Magnetite is naturally magnetic, while hematite is usually weakly magnetic or nonmagnetic. The visible rounded, highly textured form could also represent botryoidal hematite or weathered ironstone.

Field identification & locations

Common in banded iron formations, volcanic districts, hydrothermal veins, and heavily weathered iron-rich soils worldwide. Check magnetism, streak color, density, and whether bubbles or glassy areas suggest slag rather than natural material.