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Eckermannite
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| Eckermannite_1 Formula: O22 F2 Si8 Mg4.038 In.962 Na3 Name: Eckermannite Unit cell: 9.8527 18.0966 5.2928 90.0 103.521 90.0 , V=917.55 Space group: C12/M1 (12) |
Raudsepp M , Turnock A C , Hawthorne F C , American Mineralogist , 72 (1987) p.959-964, Characterization of cation ordering in synthetic scandium-fluor-eckermannite,, indium-fluor-eckermannite, and scandium-fluor-nyboite by Rietveld structure, refinement, Sample: FInEC-A3
