In proposing the one-dimensional structural scheme for the synthetic hydroxycarbonate, Mg6Al2CO3(OH)16·4H2O, (Ross and Kodama, 1967) we had already considered among others a structure similar to the one recently determined for sjogrenite by Allmann and Lohse (1966). However, we could not revise the structural scheme which had originally been outlined by Feitknecht (1942), since our X-ray intensity data appeared to be more consistent with the proposed structural scheme as shown by a comparison in the following table.

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