mineral

Weathered iron-rich rock, possibly hematite-bearing chert

Hematite (Fe₂O₃), likely mixed with silica and iron oxides

AI-generated identification · may be incorrect

Dark reddish-brown to gray, earthy-to-submetallic luster, irregular massive texture, and no obvious cleavage; estimated Mohs hardness 5–6, with a characteristic red-brown streak if hematite-rich. The image alone cannot confirm mineral identity.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed by oxidation and concentration of iron in sedimentary or hydrothermal material, potentially billions of years old; surface weathering has produced the brown-red coloration.

Uses & applications

Common hematite is used as an iron ore, pigment, polishing compound, and decorative stone; ordinary pieces have little jewelry value.

Geological facts

Hematite’s diagnostic feature is its red to reddish-brown streak, even when the specimen appears black or brown. Magnetic response is usually weak unless mixed with magnetite.

Field identification & locations

Common in banded iron formations and weathered iron-rich deposits worldwide, including Brazil, Australia, India, and the Lake Superior region. Test streak on unglazed porcelain and compare hardness against glass.