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Dominant species
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Ludwigite
Ludwigite
Chemical
Formula
Mg2Fe3+BO5
Species
Borates
Crystal
System
Orthorhombic
Mohs
Scale
5
Specific
Gravity
3.6-3.8
Color
Pitch-black, olive-black
Streak
greenish black
Luster
Silky
Refractive
Index
n = 1.830 - 1.850 n = 1.830 - 1.850 n = 1.940 - 2.020
Diaphaneity
Opaque
Cleavage
None Observed
Fracture
Fibrous
Crystal Habit:Massive - fibrous commonly in fanlike to felted aggregates
Geological Setting:In contact metamorphic deposits as high-temperature phases.
Ludwigite is a magnesium-iron borate mineral: Mg2FeBO5.

Ludwigite typically occurs in magnesian iron skarn and other high temperature contact metamorphic deposits. It occurs in association with magnetite, forsterite, clinohumite and the borates vonsenite and szaibelyite. It forma a solid solution series with the iron(II)-iron(III) borate mineral vonsenite.

It was first described in 1874 for an occurrence in Ocna de Fier, Banat Mountains, Caras-Severin, Romania and named for Ernst Ludwig (1842-1915), an Austrian chemist at the University of Vienna.


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