Magnetite



 

Composition: FE2,FE3,2o4
Cleavage: none
Streak: Black
Hardness: 51/2  61/2
Luster: Metallic
uses: Can be used for magnets.

Other examples: Franklinite, Spinel, Chromite
Commonly occurs with: Calcite, Talc, Pyrite, Garnet, Chlorite, Apatite, Hematite, Llmenite, Phlogopite
Variable Formula: (Fe, Mn, Zn, Ni)2, (Fe, Al, Cr, Mv,v)3 2o4

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