General Information:
Chemical Formula:
(Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4
Composition:
(Molecular Weight = 227.38 gm)
Magnesium 1.07 % Mg
Manganese 26.58 % Mn
Iron 44.21 % Fe
Oxygen 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
More details...