Magnetite
Iankaroka corundum occurrence, Ianabinda, Betroka District, Anosy, Madagascar
5.13 carats
© Rarestone.com
Magnetite is a heavy material, black or brownish-black with a metallic luster. It is the most magnetic of all natural commonly occurring minerals on the Earth.
The originally bright black colour can gradually change to dark brown.
Magnetite is often used in jewelry due to its supposed magnetic healing properties.
Magnetite Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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| General Information | ||||||||||||||||
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| Chemical Formula |
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| Physical Properties of Magnetite | ||||||||||||||||
| Mohs Hardness | 5.5 to 6.5, Gemmological Tables (2004) | |||||||||||||||
| Specific Gravity | 5.2, Gemstones of the world (2001) More from other references | |||||||||||||||
| Tenacity | Brittle, Management Team (2012) | |||||||||||||||
| Cleavage Quality | Good, Management Team (2012) | |||||||||||||||
| Fracture | Uneven,Irregular, Management Team (2012) | |||||||||||||||
| Optical Properties of Magnetite | ||||||||||||||||
| Refractive Index | 2.42, Gemmological Tables (2004) | |||||||||||||||
| Optical Character | Isotropic, Gemmological Tables (2004) | |||||||||||||||
| Colour | ||||||||||||||||
| Colour (General) | Black, Gemmological Tables (2004) More from other references | |||||||||||||||
| Transparency | Opaque, Gemmological Tables (2004) | |||||||||||||||
| Lustre | Metallic, Gemstones of the world (2001) More from other references | |||||||||||||||
| Crystallography of Magnetite | ||||||||||||||||
| Crystal System | Isometric, Gemmological Tables (2004) | |||||||||||||||
| Further Information | ||||||||||||||||
| Mineral information: | Magnetite information at mindat.org | |||||||||||||||
| Significant Gem Localities | ||||||||||||||||
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