mineral
Likely magnetite (small rough crystal)
Magnetite, Fe₃O₄
AI-generated identification · may be incorrectDark steel-gray to black with a metallic-to-submetallic luster; magnetite has Mohs hardness 5.5–6.5, an isometric crystal structure, and no cleavage. The photo is too small and indistinct for a certain identification; the specimen may also be another dark mineral.
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Physical properties
Dark steel-gray to black with a metallic-to-submetallic luster; magnetite has Mohs hardness 5.5–6.5, an isometric crystal structure, and no cleavage. The photo is too small and indistinct for a certain identification; the specimen may also be another dark mineral.
Formation & geological history
Magnetite forms in igneous and metamorphic rocks, in hydrothermal veins, and as a sedimentary placer mineral. It occurs across geological ages and is commonly concentrated by erosion because of its density and magnetism.
Uses & applications
A major iron ore used to make steel; attractive crystals and magnetic specimens are collected, while gem use is uncommon.
Geological facts
Magnetite is strongly magnetic, and naturally magnetized pieces are called lodestone.
Field identification & locations
Check for attraction to a magnet, a dark streak, and relatively high density; these tests help distinguish it from similar black minerals. Magnetite occurs worldwide, including in banded iron formations and beach sands.
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