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Ludwigite from central Sweden: new data and crystal structure refinement

Published online by Cambridge University Press:  05 July 2018

P. W. U. Appel  and
M. F. Brigatti
P. W. U. Appel
Affiliation:
Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 NV, Copenhagen, Denmark
M. F. Brigatti
Affiliation:
Dipartimento di Scienze della Terra, Università di Modena, Largo S. Eufemia 19, I-41100, Modena, Italy
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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.

Keywords

ludwigiteTallgruvanSwedenborateschemistrystructure refinement
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 4 , August 1999 , pp. 511 - 518
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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