mineral

Possibly raw hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄)

AI-generated identification · may be incorrect

Dark gray to black, metallic-to-submetallic luster, irregular fracture, and opaque appearance; hematite has Mohs hardness 5–6.5, while magnetite is 5.5–6.5 and strongly magnetic. The image alone cannot reliably distinguish them.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Both are iron-oxide minerals formed in igneous, metamorphic, and hydrothermal environments; hematite also commonly forms by weathering and sedimentary precipitation. Their ages vary from recent deposits to Precambrian banded-iron formations.

Uses & applications

Used as iron ore, heavy aggregate, pigments, and mineral specimens; hematite is occasionally cut for jewelry, while magnetite is mainly industrial or collectible.

Geological facts

Hematite produces a diagnostic red-to-reddish-brown streak; magnetite produces a black streak and attracts a magnet. The specimen’s bluish-black reflective surface may also indicate coating, slag, or another mineral, so testing is needed.

Field identification & locations

Check streak on unglazed porcelain, magnetism, and specific gravity; avoid destructive tests on valuable pieces. Common sources include Brazil, Australia, China, South Africa, and the United States.