Tag: Cornish stone; Cornwall stone

K2O/Na2O/CaO×Al2O3×10SiO2—HT feldspathic alkaline flux containing calcium and potassium, but more refractory than potash feldspars. Substitution eight parts potash feldspar, two parts silica, one part kaolin. Toxic in inhalation. Source: Clay: A Studio Handbook

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