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 far three crystals showing slightly different Al contents, in the space group Pbam (agreement factor: 2.42 less than or equal to R less than or equal to 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.
Ludwigite from central Sweden: new data and crystal structure refinement / P. W. U., Appel; Brigatti, Maria Franca. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - STAMPA. - 63(1999), pp. 511-518.
Data di pubblicazione: | 1999 |
Titolo: | Ludwigite from central Sweden: new data and crystal structure refinement |
Autore/i: | P. W. U., Appel; Brigatti, Maria Franca |
Autore/i UNIMORE: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1180/002646199548682 |
Rivista: | |
Volume: | 63 |
Pagina iniziale: | 511 |
Pagina finale: | 518 |
Codice identificativo ISI: | WOS:000081817900005 |
Codice identificativo Scopus: | 2-s2.0-0032738448 |
Citazione: | Ludwigite from central Sweden: new data and crystal structure refinement / P. W. U., Appel; Brigatti, Maria Franca. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - STAMPA. - 63(1999), pp. 511-518. |
Tipologia | Articolo su rivista |
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