mineral

Polished hematite

Hematite, iron(III) oxide (α-Fe₂O₃)

AI-generated identification · may be incorrect

Opaque, metallic to submetallic steel-gray surface; Mohs hardness 5–6.5, trigonal crystal structure, and a distinctive reddish-brown streak. The pictured piece is a polished, rounded specimen.

Identified October 13, 2026More mineral →

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Physical properties

Opaque, metallic to submetallic steel-gray surface; Mohs hardness 5–6.5, trigonal crystal structure, and a distinctive reddish-brown streak. The pictured piece is a polished, rounded specimen.

Formation & geological history

Hematite forms through iron-rich fluids, chemical sedimentation, or oxidation of other iron minerals; it occurs in rocks spanning much of Earth’s geological history.

Uses & applications

Used as iron ore and pigment; polished hematite is also made into beads, jewelry, and display pieces.

Geological facts

Despite its dark metallic appearance, hematite typically leaves a red-brown streak when rubbed on unglazed porcelain.

Field identification & locations

Look for the heavy feel, metallic gray surface, and red-brown streak; common in banded iron formations and many iron-rich deposits worldwide. The photo alone cannot confirm the mineral, so streak testing is useful.