mineral

Tumbled hematite

Hematite (Fe₂O₃), commonly sold as “magnetic hematite” when synthetic or magnetized

AI-generated identification · may be incorrect

Hardness 5–6.5 Mohs; steel-gray to black, metallic luster, opaque, and typically weakly magnetic or nonmagnetic in natural form. Tumbled pieces have rounded surfaces and a mirror-like polish; crystal structure is trigonal.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Hematite forms through oxidation in iron-rich sedimentary, hydrothermal, and metamorphic environments, with deposits ranging from Precambrian banded iron formations to younger iron ores. These pieces have been mechanically tumbled and polished.

Uses & applications

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

Geological facts

Its red-brown streak is diagnostic despite the black metallic appearance. Strongly magnetic “hematite” jewelry is often synthetic magnetite or ferrite rather than natural hematite.

Field identification & locations

Identify by its very high density (about 5.3 g/cm³), metallic appearance, and reddish-brown streak; a streak test on unimportant material helps distinguish it from magnetite. Common sources include Brazil, Australia, China, and the United States.