A highly plastic, sometimes refractory clay, commonly characterized by the presence of organic matter, having unfired colors ranging from light buff to various shades of gray, and used as a bonding constituent of ceramic wares; pipe clay. It has high wet and dry strength, long vitrification range, and high firing shrinkage. Ball clay is so named because of the early English practice of rolling the clay into balls weighing 30 to 50 lb (13 to 22 kg) and having diameters of about 10 in (25 cm). AGI
Source: Dictionary of Mining, Mineral, and Related Terms












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