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This paper describes t he preparation for analysis of a number of refrac tory oxides, ceramic materials, and m inerals by decomposit ion with hydrochloric or bydriodic a.cid at t emperatures up to 3000 C. All the oxides of the elements in the second, t hird, and fourth groups of the periodic system, with t he exception of silica, t itania, zirconia, and possibly hafnia, respond to the t reat ment. A number of silicate minerals, ordinarily difficult to prepare for analysis, are likewise successfully decomposed . CONTENTS Page

Preparing refractory oxides, silicates, and ceramic materials for analysis, by heating with acids in sealed tubes at elevated temperatures