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High-resolution transmission electron microscopy has provided evidence for ordering of [Na4.SO4]2+ and [Na4.H2O]4+ clusters in nosean, ideally Na8[Al6Si6O24]SO4.H2O. Reflections of type hhl, l = 2n + 1, indicate that space group P4̄3n is an average for nosean. Space group P23, a subgroup of P4̄3n, applies to one type of domain that occurs in nosean...