mineral
Magnetite
Fe3O4
AI-generated identification · may be incorrectHardness of 5.5-6.5 on Mohs scale, black to brownish-gray color, metallic to submetallic luster, isometric crystal system, and strong magnetism.
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Physical properties
Hardness of 5.5-6.5 on Mohs scale, black to brownish-gray color, metallic to submetallic luster, isometric crystal system, and strong magnetism.
Formation & geological history
Forms in igneous and metamorphic rocks, as well as high-temperature hydrothermal veins, dating across various geological eras.
Uses & applications
Used as an ore of iron, in heavy media separation, water purification, and as a component in magnetic recording media.
Geological facts
Magnetite is the most magnetic naturally occurring mineral on Earth and sometimes exhibits natural polarity called lodestone.
Field identification & locations
Easily identified by its strong magnetic attraction, black streak, and high specific gravity; found worldwide in beach sands and rock formations.
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Limonite
FeO(OH)•nH2O
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sedimentary
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
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Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous