mineral

Polished hematite

Hematite (Fe₂O₃), likely a tumbled specimen

AI-generated identification · may be incorrect

Metallic gray to steel-black, smooth polished surface, opaque, and typically nonmagnetic or weakly magnetic; hardness 5–6.5 Mohs, trigonal crystal structure, no distinct cleavage, specific gravity about 5.3.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Hematite forms through oxidation of iron-rich rocks, hydrothermal processes, sedimentary iron formation, or weathering; deposits range from Precambrian banded-iron formations to younger hydrothermal and sedimentary settings.

Uses & applications

Used as an iron ore, pigment, polishing powder, and ornamental stone; polished pieces are inexpensive collector specimens and are sometimes marketed as jewelry.

Geological facts

Its red-brown streak is diagnostic even when the surface is metallic black. Strong attraction to a magnet may indicate magnetite or manufactured hematite containing magnetic material.

Field identification & locations

Commonly found in Brazil, Australia, the United States, South Africa, and India; identify with a streak test on unglazed porcelain, which should produce a reddish-brown streak. The image is consistent with polished hematite, though visual identification alone is not definitive.