General Information:
Chemical Formula:
Mg2(Mn+++,Fe+++)O2(BO3)
Composition:
(Molecular Weight = 253.62 gm)
Magnesium 19.17 % Mg
Manganese 10.83 % Mn
Iron 11.01 % Fe
Boron 8.52 % B
Oxygen 50.47 % O
Empirical Formula:
Mg2Mn3+0.5Fe3+0.5O2(BO3)
Environment:
In dolomite.
IMA Status:
Approved IMA
Locality:
Langban, Varmland, Sweden.
Name Origin:
Named for Kurt A. Fredriksson (1926-), Swedish-U.S. Geochemist.
Physical Properties:
Cleavage:
[???] Poor, [???] Indistinct
Color:
reddish brown.
Density:
3.84
Diaphaniety:
Translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., ,
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
yellowish brown
More details...