"Analcime in acid-intermediate tuffs and volcanic sedimentary rocks at Currabubula, New South Wales, has probably formed due to mild P/T (zeolite mineral facies) reconstitution of glass shards and fine volcanic ash matrix. The analcime co-exists with quartz-alkali feldspar-heulandite-chlorite-montmorillonite-(calcite-albite). Analyses of two analcimes from rocks of differing bulk composition indicate the mineral to be moderately silica-rich. . . . Soda metasomatism is not considered an important factor in analcime genesis in the rocks under discussion."