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The crystal structure of magbasite from the Eldor carbonatite complex, Quebec, Canada, has been determined and indicates that the currently accepted formula should be revised to KBaFe3+Mg7Si8O22(OH)2F6. Magbasite is orthorhombic, space group Cmme (Cmma), with unit-cell parameters a 18.9506(3) Å, b 22.5045(3) Å, c 5.2780(1) Å, V 2250.93(6) Å3 (Z = 4). The structure has been solved and refined to final agreement indices R 1 = 0.026, wR 2 = 0.052, GooF = 1.116 for a total of 2379 uniquedoi:10.1180/minmag.2014.078.1.03 fatcat:scsbsczcezgk5dpqqky2s7lmla