mineral
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
Hardness: 5.5-6.5; Color: Black to brownish-black; Luster: Metallic to submetallic; Crystal structure: Isometric/Octahedral; Specific Gravity: 5.1-5.2; Streak: Black
- 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/Octahedral; Specific Gravity: 5.1-5.2; Streak: Black
Formation & geological history
Found in igneous, metamorphic, and sedimentary rocks. Formed through magmatic segregation, contact metamorphism, or as a heavy mineral sand in sedimentary deposits. It is one of the most abundant iron oxide minerals.
Uses & applications
Primary ore of iron used for steel production. Used in medical imaging (MRI), as a heavy media for coal washing, and as a pigment in paints/ceramics.
Geological facts
Naturally magnetized magnetite is known as 'lodestone,' which was used in ancient times as the first compasses. It is the most magnetic naturally occurring mineral on Earth.
Field identification & locations
Identify by its strong attraction to a magnet and its black streak. Often feels heavy for its size due to high specific gravity. Found globally, notably in Sweden, Brazil, and the USA (Mesabi Range).
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous