igneous
Likely magnetite-bearing rock
Magnetite (Fe₃O₄), possibly in a mafic host rock
AI-generated identification · may be incorrectDark gray to black, metallic to submetallic luster with a lighter reflective fracture surface; magnetite is Mohs 5.5–6.5, isometric, and has no cleavage. The photo alone cannot confirm composition or distinguish it from other dark metallic minerals.
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Physical properties
Dark gray to black, metallic to submetallic luster with a lighter reflective fracture surface; magnetite is Mohs 5.5–6.5, isometric, and has no cleavage. The photo alone cannot confirm composition or distinguish it from other dark metallic minerals.
Formation & geological history
Magnetite commonly crystallizes in igneous rocks and forms in hydrothermal veins or iron-rich deposits; its age depends on the host rock.
Uses & applications
Magnetite is a major iron ore and is also collected as a mineral specimen.
Geological facts
A magnet test is a useful first check: magnetite is strongly magnetic, though some similar-looking minerals are not.
Field identification & locations
Look for strong attraction to a magnet and a black streak on unglazed porcelain; the specimen’s small size and appearance are insufficient for a definitive identification. Magnetite occurs worldwide, including in igneous and metamorphic terrains.
