Nordstrandite, Al(OH)3, occurs as thin fissure fillings in dolomitic marlstones and oil shale of the Green River Formation in northwestern Colorado. Here. and in New South Wales, Australia, it is found with dawsonite, NaAlCO3(OH)2, but in the seven other known occurrences it is found with gibbsite in bauxitized igneous rock or karst limestone residues. The occurrence may explain the “surplus Al2O3” observed in chemical analyses of dawsonite-bearing oil shale in Colorado; thermal study suggests that this is present as an aluminum hvdroxide.

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