Natural magnets (lodestones) were known to ancient Greeks, who called this mineral "magnet", because it was found in the lands of the Magnetes (Magnesia) in Thessaly.
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.
|Chemical Formula||Gemmological Tables (2004) , More from other references|
|Photos of natural/un-cut material from mindat.org|
|Physical Properties of Magnetite|
|Mohs Hardness||5.5 to 6.5Gemmological Tables (2004) , |
|Specific Gravity||5.2Gemstones of the world (2001) , More from other references|
|Tenacity||BrittleManagement Team (2012) , |
|Cleavage Quality||GoodManagement Team (2012) , |
|Fracture||Uneven,IrregularManagement Team (2012) , |
|Optical Properties of Magnetite|
|Refractive Index||2.42Gemmological Tables (2004) , |
|Optical Character||IsotropicGemmological Tables (2004) , |
|Colour (General)||BlackGemmological Tables (2004) , More from other references|
|Transparency||OpaqueGemmological Tables (2004) , |
|Lustre||MetallicGemstones of the world (2001) , More from other references|
|Crystallography of Magnetite|
|Crystal System||IsometricGemmological Tables (2004) , |
|Mineral information:||Magnetite information at mindat.org|
|Significant Gem Localities|