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Published online by Cambridge University Press: 02 May 2018
A study was made of five clays used for brickmaking to determine the reason why certain clays crumbled on firing. Partially weathered biotite was found to be a constituent of the clays which crumbled and the crumbling was due to this mineral exfoliating and so disrupting the bricks at a comparatively low temperature. Fresh biotite and highly weathered biotite do not have this adverse effect.