Dawsonite [NaAlCO3(OH)2] and nordstrandite [Al(OH)3] are associated in Permian marine strata of the Sydney Basin. The dawsonite, which appears to have developed in a highly alkaline tidal or supratidal flat environment, occurs as fibrous aggregates in silt-stones, as carbonate replacements in pseudomorphs after glauberite and in nodules contained within dolomite. The dawsonite probably formed by the reaction between sodium aluminate and carbonate-rich solutions whereas the nordstrandite appears to have developed from dawsonite through the loss of soda.

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