General Information:
Chemical Formula:(Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4
Composition:(Molecular Weight = 227.38 gm)Magnesium 1.07 %
MgManganese 26.58 %
MnIron 44.21 %
FeOxygen 28.15 %
O Empirical Formula: Mn2+0.6Fe2+0.3Mg0.1Fe3+1.5Mn3+0.5O4
Locality:Jakobsberg, Sweden.
Name Origin:Named after its locality.
Physical Properties: Cleavage:None
Color:iron black or black.
Density:4.75
Diaphaniety:Opaque
Habits:Disseminated - Occurs in small, distinct particles dispersed in matrix., Massive - Granular - Common texture observed in granite and other igneous rock.,
Hardness:5.5-6 - Knife Blade-Orthoclase
Luster:Sub Metallic
Streak:reddish black
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