In 2006, I published a paper in The Canadian Mineralogist (Rosenberg 2006) that contained several unfortunate errors in the X-ray data for one of the synthetic phases, AlF2(OH)·xH2O (AFH). This phase has a structure similar to that of β-AlF3 (Rosenberg 2006). Although β-AlF3 is pseudohexagonal, its true symmetry is orthorhombic (PDF#01–084–1672). The apparent hexagonal symmetry is due to the existence of three orthorhombic domains rotated by 120° around a common c axis (Le Bail et al. 1988). However, the hexagonal pseudosymmetry provides an adequate basis for...

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