Magnetite is a naturally occurring iron oxide with the chemical formula Fe3O4. It is mined from several deposits worldwide and although most is used to make iron and steel, the many special properties of magnetite have led to several other applications including as a filler for plastics and coatings. In many ways, magnetite is the opposite of common mineral fillers. An overview is presented here. More detail can be found in the articles and encyclopedia chapter mentioned below.
- Appearance: Black, shiny, lustrous
- Density: High, 5.2 gcm-3
- Thermal conductivity: High
- Electrical conductivity: Semi-conductive (ρ 45 Ωm)
- Radiation blocking: Very good (neutrons and x-rays)
- Specific heat capacity: Exceptionally high
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