mineral
Magnetite
Magnetite (Fe3O4)
Hardness: 5.5-6.5 on the Mohs scale; Color: Black to silvery-dark gray; Luster: Metallic to sub-metallic; Crystal Structure: Isometric (cubic); Cleavage: None, exhibits octahedral parting; Specific Gravity: 5.15
- Hardness
- 5
- Color
- Black to silvery-dark gray
- Luster
- Metallic to sub-metallic
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Physical properties
Hardness: 5.5-6.5 on the Mohs scale; Color: Black to silvery-dark gray; Luster: Metallic to sub-metallic; Crystal Structure: Isometric (cubic); Cleavage: None, exhibits octahedral parting; Specific Gravity: 5.15
Formation & geological history
Forms in various environments including igneous rocks (as an accessory mineral), metamorphic rocks, and hydrothermal deposits, often through magmatic segregation or low-temperature oxidation processes.
Uses & applications
Major ore of iron, used in heavy media separation, steel production, water purification, and occasionally as a gemstone or magnet for educational purposes.
Geological facts
Magnetite is the most magnetic naturally occurring mineral on Earth. Ancient mariners used pieces of magnetite known as lodestones as early compasses for navigation.
Field identification & locations
Easily identified by its strong magnetic attraction, black streak, and high density. Commonly found in beach sands, igneous intrusions, and metamorphic iron formations worldwide.
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