mineral
Magnetite
Magnetite (Fe3O4)
AI-generated identification · may be incorrectHardness: 5.5-6.5; Color: Black to silvery gray; Luster: Metallic to submetallic; Crystal structure: Isometric (Octahedral); Cleavage: None (parting); Specific Gravity: 5.1-5.2
- Hardness
- 5
- Color
- Black to silvery gray
- Luster
- Metallic to submetallic
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Physical properties
Hardness: 5.5-6.5; Color: Black to silvery gray; Luster: Metallic to submetallic; Crystal structure: Isometric (Octahedral); Cleavage: None (parting); Specific Gravity: 5.1-5.2
Formation & geological history
Forms in igneous rocks through magmatic segregation, in metamorphic rocks like marble and greenstone, and as heavy sand in sedimentary environments. Common in banded iron formations.
Uses & applications
Major ore of iron for steel production. Used in water purification, industrial pigments, and as a component in heavy concrete for radiation shielding.
Geological facts
It is the most magnetic of all naturally occurring minerals on Earth. Naturally magnetized pieces called lodestones were used to create the earliest compasses.
Field identification & locations
Identify using a magnet; it is strongly attracted and can even be naturally magnetic. Found worldwide in iron-rich geological regions. Collectors look for well-defined octahedral crystals.
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