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Al.O albite alkali alumina aluminium analysis anorthite artist atoms ball clay ball-mill batch become begins bricks calcium carbonate cent centre ceramic chamber china clay clay mineral colour composition cone cooling cordierite crazing cristobalite crystals diameter earthenware Fe.O felspar Figure fireclay fired strength formula weight free silica fusible glass granite grinding grog handle heat illite inches iron oxide kaolin kaolinite kiln limestone liquid lump material melt method mica mill mixed mixture montmorillonite mould mullite Na.O neck nepheline nepheline syenite Nigeria oxygen particles petalite plagioclase plastic clay porcelain porous potash felspar pots potters pure quantity quartz range refractory rocks saggars sand shape sieves silica silicon slightly slip spout stage stoneware stoneware bodies stoneware glazes surface teapots temperature tetrahedra texture thermal expansion thick thin thrower throwing usually vitrified ware wheel zircon