Citation: Raudsepp, M.; Turnock, A. C.; Hawthorne, F. C. (1987). Characterization of cation ordering in synthetic scandium-fluor-eckermannite, indium-fluor-eckermannite, and scandium-fluor-nyboite by Rietveld structure refinement Sample: FInEC-A3. American Mineralogist, 72, pp. 959-964.