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Mineralpedia Details for Magnetite

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Magnetite

Magnetite

Magnetite is an old term that is possibly in reference to Magnesia in Greece which was a site for lodestone. Magnetite is a common mineral with thousands of localities worldwide. It is “a common accessory mineral in igneous and metamorphic rocks in which magmatic segregations or contact metamorphism may produce economically viable deposits [as well as] in sedimentary banded iron formations, [as] a biogenic product, [and in] important detrital deposits.” Magnetite, as one can determine from its name, is highly magnetic.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/magnetite.pdf

Formula
Fe2+Fe3+2O4 
Crystal System
Isometric 
Crystal Habit
Massive, Massive - Granular, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Metallic 
Color
grayish black, iron black 
Streak
black 
Class
Isometric - Hexoctahedral 
Fracture
Sub Conchoidal 
Hardness
5.5-6 
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Magnetite from Långban, Filipstad, Värmland, Sweden

Magnetite
            from Långban, Filipstad, Värmland, Sweden

Octahedral, brilliant Magnetite crystals to 5mm.

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Magnetite from Christie mine, Fresno Co., California, United States

Magnetite
            from Christie mine, Fresno Co., California, United States

Black, lustrous, octahedral crystals of Magneite to 6mm throughout Dolomite matrix.

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Magnetite from Binntal, Wallis, Switzerland

Magnetite
            from Binntal, Wallis, Switzerland

Excellent, sharp, octahedral crystals, the largest to 8mm across with several smaller and an unidentified red mineral, whih is probably Sphalerite. Old specimen from the University of Chicago with matching numbers on label and specimen. See Provenance tab.

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Magnetite from Cerro Huañaquino, Potosí, Bolivia

Magnetite
            from Cerro Huañaquino, Potosí, Bolivia

Octahedral crystals to 1.2cm.

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