mineral

Magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly mixed with hematite or metallic sulfides

AI-generated identification · may be incorrect

Black to steel-gray, submetallic-to-metallic luster, irregular massive texture, and high density (specific gravity about 5.2). Magnetite has Mohs hardness 5.5–6.5 and is strongly magnetic; crystal structure is cubic, though this specimen is not visibly crystalline.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in igneous and metamorphic iron deposits, hydrothermal veins, and banded iron formations, ranging from Precambrian to recent geological ages. The specimen appears naturally weathered and massive rather than a manufactured material.

Uses & applications

Magnetite is an important iron ore and is used in steel production, dense concrete, pigments, and magnetic applications; attractive specimens have modest collecting value.

Geological facts

Its defining feature is strong attraction to a magnet, often stronger than ordinary dark rocks. A gray-black streak and unusually heavy feel further support identification.

Field identification & locations

Test with a strong magnet, streak it on unglazed porcelain, and compare its weight with similarly sized rocks; magnetite leaves a black streak, whereas hematite leaves red-brown. Common sources include banded iron formations and volcanic or metamorphic terrains worldwide.