mineral

Tumbled hematite

Hematite (α-Fe₂O₃)

AI-generated identification · may be incorrect

Polished steel-gray to black surface with metallic luster; Mohs hardness 5–6.5, trigonal crystal structure, and no prominent cleavage; notably dense (specific gravity about 5.3).

Identified October 8, 2026More mineral →

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Physical properties

Polished steel-gray to black surface with metallic luster; Mohs hardness 5–6.5, trigonal crystal structure, and no prominent cleavage; notably dense (specific gravity about 5.3).

Formation & geological history

An iron-oxide mineral formed in sedimentary iron deposits, hydrothermal settings, and by oxidation of iron-bearing rocks; specimens range from ancient deposits to recent weathering products. This piece has been tumbled and polished.

Uses & applications

Used as iron ore, pigment, and ornamental material for beads, carvings, and jewelry.

Geological facts

Despite its metallic appearance, hematite typically leaves a reddish-brown streak—a useful diagnostic test.

Field identification & locations

The smooth, reflective gray-black pebble is consistent with polished hematite, though appearance alone cannot confirm identification. Common sources include Brazil, Australia, and iron formations worldwide.