mineral

Tumbled hematite (likely hematite-rich ironstone)

Hematite, Fe₂O₃; possibly mixed with magnetite or goethite

AI-generated identification · may be incorrect

Dark steel-gray to black, metallic-to-submetallic luster, uneven/conchoidal fracture, and hardness about 5–6.5 Mohs; hematite has a reddish-brown streak, while magnetite is strongly magnetic.

Identified August 11, 2026More mineral →

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Physical properties

Dark steel-gray to black, metallic-to-submetallic luster, uneven/conchoidal fracture, and hardness about 5–6.5 Mohs; hematite has a reddish-brown streak, while magnetite is strongly magnetic.

Formation & geological history

Forms by oxidation and precipitation of iron in hydrothermal, sedimentary, or metamorphic environments, commonly in Precambrian banded iron formations. The rounded shape appears human-tumbled or naturally water-worn.

Uses & applications

Used as an iron ore, pigment, polishing material, and ornamental stone; polished hematite is also used in inexpensive jewelry and carvings.

Geological facts

Despite its black appearance, hematite typically produces a red to reddish-brown streak. The specimen’s very dark color and glossy surface could indicate magnetite-bearing hematite, but the image cannot confirm this.

Field identification & locations

Test with an unglazed ceramic streak plate: hematite leaves red-brown powder; magnetite leaves black streak and attracts a magnet. Common localities include Brazil, Australia, India, South Africa, and the United States.