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Dominant species
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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.
Ludwigite5583
Ludwigite5583
Ludwigite5579
Ludwigite5579
Ludwigite5570
Ludwigite5570
Ludwigite5566
Ludwigite5566
Ludwigite5563
Ludwigite5563
Ludwigite5554
Ludwigite5554

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