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Effect of biotite on the firing characteristics of certain weathered schists

Published online by Cambridge University Press:  02 May 2018

K. Norrish
Division of Soils, C.S.I.R.O., Adelaide, South Australia
E. W. Radoslovich
Division of Soils, C.S.I.R.O., Adelaide, South Australia
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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.

Research Article
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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