Jacobsite

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Jacobsite
Category Mineral
Chemical formula iron(II,III) manganese oxide, MnFe2O4
Identification
Color Black
Crystal habit Disseminated to massive
Crystal system Isometric Hexoctahedral
Cleavage none
Fracture Conchoidal
Mohs Scale hardness 5.5 - 6.0
Luster Metallic
Refractive index Opaque
Streak reddish black
Specific gravity 4.75

Jacobsite is a manganese iron oxide mineral. It is a magnetite spinel.

It was first described in 1869 and named for the location of Jakobsberg, Sweden.

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