Definitions for ball clay

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Wiktionary

  1. ball clay(Noun)

    A type of clay.

  2. Origin: Ball clay is named after the clay found in Dorset, and Devon England where it was cut into balls that weighed 30 pounds.

Freebase

  1. Ball clay

    Ball clays are kaolinitic sedimentary clays, that commonly consist of 20-80% kaolinite, 10-25% mica, 6-65% quartz. Localized seams in the same deposit have variations in composition, including the quantity of the major minerals, accessory minerals and carbonaceous materials such as lignite. They are fine-grained and plastic in nature. Ball clays are relatively scarce deposits due to the combination of geological factors needed for their formation and preservation. They are mined in parts of the Eastern United States and from three sites in Devon and Dorset in South West England. They are commonly used in the construction of many ceramic articles, where their primary role is to either to impart plasticity or to aid rheological stability during the shaping processes.

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