Abstract
The structures of natural iron-rich eudialyte (specimen 3458 from the Khibiny massif, the Kola Peninsula) and two heat-treated samples of this mineral calcined at 700 and 800°C were determined by X-ray diffraction. The trigonal unit-cell parameters (sp. gr. R3m) are as follows: a = 14.2645(1) A, c = 29.9635(5) A; a = 14.1307(1) A, c = 30.1229(3) A; a = 14.1921(2) A, c = 30.2417(5) A, respectively. It was found that Fe3+ ions in the calcined eudialytes, as well as impurities in the starting specimen, occupy the square-pyramidal Fe3+(V) sites, whereas Fe2+ ions are in the planar-tetragonal Fe2+(IV) sites.
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