mineral

Tumbled metallic-gray stone, likely hematite or magnetite

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

AI-generated identification · may be incorrect

Dark gray to black, metallic-to-submetallic luster, opaque, fine-grained and smoothly tumbled. Hematite has Mohs hardness 5–6.5 and a reddish-brown streak; magnetite has hardness 5.5–6.5 and is strongly magnetic, with no visible cleavage.

Identified August 30, 2026More mineral →

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At a glance

Common name: Tumbled metallic-gray stone, likely hematite or magnetite
Scientific name: Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as a small tumbled specimen; unusual natural crystal forms or confirmed high-quality pieces may sell for $20–$100+.

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

These iron oxides form in hydrothermal, igneous, metamorphic, and sedimentary environments; their formation spans much of Earth’s geological history. The rounded shape indicates human tumbling or polishing.

Uses & applications

Used as iron ore, pigment, abrasive, and ornamental material; polished hematite is common in inexpensive jewelry and metaphysical collections. Magnetite is also used in industrial magnetic applications.

Geological facts

A streak test is more diagnostic than appearance: hematite leaves a red to reddish-brown streak, while magnetite leaves a black streak. A strong attraction to a magnet strongly favors magnetite.

Field identification & locations

Common sources include Brazil, South Africa, Australia, the United States, and Canada. Test magnetism and streak on unglazed porcelain; avoid scratching valuable surfaces.