Dawsonite and nordstrandite in the permian berry formation of the Sydney Basin, New South Wales

R. Goldbery; F. C. Loughnan

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Research Article| April 01, 1970

Dawsonite and nordstrandite in the permian berry formation of the Sydney Basin, New South Wales

R. Goldbery;

R. Goldbery

Geological Survey of N.S. W Dept, of Mines, Sydney, Australia.

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F. C. Loughnan

School of Applied Geology, University of N.S.W Kensington, Australia.

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Author and Article Information

R. Goldbery

Geological Survey of N.S. W Dept, of Mines, Sydney, Australia.

F. C. Loughnan

School of Applied Geology, University of N.S.W Kensington, Australia.

Publisher: Mineralogical Society of America

Received: 30 Sep 1969

Accepted: 31 Oct 1969

First Online: 06 Jul 2018

Online ISSN: 1945-3027

Print ISSN: 0003-004X

Mineralogical Society of America

American Mineralogist (1970) 55 (3-4_Part_1): 477–490.

Abstract

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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