mineral

Polished hematite (speculative)

Hematite, α-Fe₂O₃; possibly hematite-rich ironstone

AI-generated identification · may be incorrect

Dark steel-gray to black, smoothly tumbled, with metallic-to-submetallic luster and likely reddish-brown streak. Hematite has Mohs hardness 5–6.5, trigonal crystal structure, no prominent cleavage, and specific gravity about 5.0–5.3; the rounded surface makes these properties difficult to confirm visually.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms through oxidation and precipitation of iron in sedimentary, hydrothermal, and metamorphic environments, from Precambrian to recent ages. The specimen appears human-polished rather than naturally weathered.

Uses & applications

Commonly sold as a lapidary stone, ornamental cabochon, or collectible; hematite is also an important iron ore and pigment source. Not typically used as jewelry-grade material unless well polished and securely set.

Geological facts

Its diagnostic red to reddish-brown powder streak can distinguish it from metallic-looking magnetite, which gives a black streak and is strongly magnetic. Surface reflections in the image could also indicate another polished iron-rich mineral, so testing is advisable.

Field identification & locations

Check streak on unglazed ceramic, magnetism, hardness, and specific gravity; hematite generally is weakly magnetic or nonmagnetic, while magnetite is strongly magnetic. Common sources include Brazil, Australia, the United States, South Africa, and Europe.