mineral
Likely magnetite-rich rock (lodestone)
Magnetite, Fe₃O₄, possibly in a fine-grained host rock
AI-generated identification · may be incorrectDark gray to black with a metallic-to-submetallic sparkle and granular texture; magnetite has Mohs hardness 5.5–6.5, cubic structure, no cleavage, and specific gravity about 5.2. The photo alone cannot confirm its composition or magnetism.
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Physical properties
Dark gray to black with a metallic-to-submetallic sparkle and granular texture; magnetite has Mohs hardness 5.5–6.5, cubic structure, no cleavage, and specific gravity about 5.2. The photo alone cannot confirm its composition or magnetism.
Formation & geological history
Magnetite forms in igneous and metamorphic settings, including iron-rich intrusions and banded iron formations; such deposits range from ancient Precambrian to recent. A naturally magnetized piece is called lodestone.
Uses & applications
Magnetite is an important iron ore and is used in dense media, pigments, and mineral collections; lodestone is chiefly a curiosity or teaching specimen.
Geological facts
Magnetite is strongly magnetic, and naturally magnetized lodestone historically helped people recognize magnetic navigation.
Field identification & locations
Check whether it attracts a magnet; its unusually heavy feel and black streak support magnetite identification. Found worldwide in iron-rich rocks and sands.
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