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Two years ago the writer was fortunate enough to secure a considerable quantity of pollucite, which was obtained in the Paris, Maine, region. The material contained, approximately, 33% of cesium, rubidium and potassium oxides, chiefly cesium oxide, besides about 2% of lithium and sodium oxides. Through the assistance of Mr. C. C. Wallace the bases were extracted from the mineral by fine grinding and digesting with concentrated nitric acid. Treatment of the silicic acid residue with hydrofluoricdoi:10.1021/ja02271a004 fatcat:54opkx75pbglhgpqc446qxfn24