General Information:
Chemical Formula:
Mg2Fe+++BO5
Composition:
(Molecular Weight = 195.26 gm)
Magnesium 24.89 % Mg
Iron 28.60 % Fe
Boron 5.54 % B
Oxygen 40.97 % O
Empirical Formula:
Mg2Fe2+BO5
Name Origin:
Named after the Austrian chemist, E. Ludwig (1842-1915).
Physical Properties:
Cleavage:
[001] Perfect
Color:
dark green, black, or black green.
Density:
3.7 - 4, Average = 3.85
Diaphaniety:
Opaque
Habits:
Fibrous - Crystals made up of fibers., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Massive - Fibrous - Distinctly fibrous fine-grained for ms.
Hardness:
5.5 - Knife Blade
Luminescence:
None.
Luster:
Silky
Streak:
greenish black
More details...