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magnesium silicate; steatite; soapstone; talc
3MgO×4SiO2×H2O—HT alkaline earth flux in glaze, promotes smooth buttery surfaces, partial opacity—similar composition to clay, but in LT claybodies gives low shrinkage and high thermal shock resistance, as in standard 50/50 talc/ball clay whiteware body. Highly toxic in inhalation and ingestion.
