Ludwigite

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Ludwigite
General
Category Borate minerals, Ludwigite series
Chemical formula Mg2Fe3+BO5
Strunz classification 06.AB.30
Dana classification 24.02.01.01
Crystal symmetry 2/m 2/m 2/m
Identification
Molar mass 195.26 g/mol
Color dark green, black, black-green
Crystal habit Massive - Fibrous - Distinctly fibrous fine-grained forms
Crystal system orthorhombic
Cleavage [001] Perfect
Fracture Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Mohs scale hardness
Luster Silky
Streak greenish black
Specific gravity 3.7–4
Optical properties Biaxial (+), a=1.83-1.85, b=1.83-1.9, g=1.97-2.03
References [1][2][3]

Ludwigite is a magnesiumiron borate mineral named for Ernst Ludwig (1842–1915), an Austrian chemist at the University of Vienna.[1][2]

References

  1. 1.0 1.1 Ludwigite, <http://webmineral.com/data/Ludwigite.shtml> (accessed 4 December 2009), WebMineral.com.
  2. 2.0 2.1 Ludwigite, <http://www.mindat.org/show.php?id=2454> (accessed 4 December 2009), MinDat.org.
  3. Irwin, M. B.; Peterson, R. C. The crystal structure of ludwigite. Canadian Mineralogist 1999, 37, 939–43.
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