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  Home  >>  Mineral Encyclopedia  >>  Mineral Photos  >>  Magnetite-Magnetite
Magnetite
Chemical
Formula
 Fe2+Fe3+2O4
Species
 Oxides & Hydroxides
Crystal
System
 Isometric
Mohs
Scale
 5-6
Specific
Gravity
 5.17-5.18
Color
 Black, gray with brownish tint in reflected light
Streak
 Black[1]
Luster
 Metallic, Sub-Metallic
Refractive
Index
 n = 2.42
Diaphaneity
 Opaque
Cleavage
 Indistinct, parting on , very good
Fracture
 Irregular/Uneven
Crystal Habit：Octahedral, fine granular to massive
Geological Setting：Common igneous accessory mineral. In sedimentary banded iron formations.
Magnetite6341
Magnetite6341
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