Author:
Appel P. W. U.,Brigatti M. F.
Abstract
Abstract
Ludwigite from B-bearing iron ores in the Bergslagen area of central Sweden
and in the coastal area north of Stockholm has been studied using chemical and
single-crystal diffraction techniques. Structure refinements, completed for three
crystals showing slightly different Al contents, in the space group
Pbam (agreement factor: 2.42 ≤
R ≤ 2.79) indicate that: (1) octahedral M1, M2 and
M3 bond distances are similar, although the calculated site population suggests
that M1 and M2 are nearly completely occupied by Mg whereas M3 also contains
Fe2+ and Fe3+; (2) in the M4
octahedron Fe3+ and Al dominate over Mg (and
Fe2+); and (3) the distortion parameter, BLD, indicates
that M3 is the most regular, whereas M4 is the most distorted octahedron.
Subject
Geochemistry and Petrology
Cited by
8 articles.
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