A crystal structure has been proposed (Ross and Kodama, 1967) for synthetic Mg6Al2CO3(OH)16 · 4H2O. This paper was submitted in July 1966, so that its authors were not acquainted with the structure determinations of the two forms of [Mg6Fe2(OH)16][CO3·4H2O], sjögrenite (hexagonal) and pyroaurite (rhombohedral), which have appeared since then Allmann and Lohse, 1966; Ingram and Taylor, 1967; Allmann, 1968).

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