Abstract
Summary A 78 foot (24 m) ‘low level’ laterite profile from Tira, in Busia District, Uganda, is described. Mineral and chemical progressions, from the parent rock through saprolite and into the laterite, indicate its residual development. The chemical compositions of the residuum and the parent material are compared with further data from Uganda and other published results in order to assess the importance of the Fe, Al and quartz content of parent rocks in determining the chemical composition of a laterite. Quartz-richness of parent material does not appear to be disadvantageous for bauxite formation. Neither is Al-richness advantageous. This leads to the conclusion that the absence of bauxite in Uganda may be attributed to unfavourable leaching conditions rather than, as formerly believed, to the absence of suitable parent rocks.
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