mineral
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
AI-generated identification · may be incorrectHardness: 5.5-6.5; Color: Black to brownish-black; Luster: Metallic to submetallic; Crystal structure: Isometric (octahedra); Strongly magnetic; Specific Gravity: 5.17-5.18.
- Hardness
- 5
- Color
- Black to brownish-black
- Luster
- Metallic to submetallic
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Physical properties
Hardness: 5.5-6.5; Color: Black to brownish-black; Luster: Metallic to submetallic; Crystal structure: Isometric (octahedra); Strongly magnetic; Specific Gravity: 5.17-5.18.
Formation & geological history
Formed in igneous or metamorphic rocks as an accessory mineral, often concentrated in sedimentary environments as 'black sand' via weathering and erosion.
Uses & applications
Primary ore of iron; used in heavy media separation, as a pigment, and in industrial magnets.
Geological facts
Magnetite is the most magnetic naturally occurring mineral on Earth. Naturally magnetized pieces called lodestones were used to create the first compasses.
Field identification & locations
Identify by using a magnet; it will be strongly attracted. Often found in beach or river sands where heavy minerals accumulate.
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Granite
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Septarian Pebble
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