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Strontium Carbonate is a very slightly soluble source of SrO used in glazes.
Strontium carbonate is often recommended as a substitute for barium to produce matte glazes. However strontium is not a substitute for barium as a precipitator of soluble salts in clay bodies because it combines with SO4-- ions in the water to form a compound that is not nearly as insoluble as BaSO4.