Abstract
Synopsis The mineralogy of a soil derived from the weathering of an ultrabasic rock near the summit area of Askival on the Island of Rhum was investigated by optical, X-ray diffraction and differential thermal techniques. The fine sand fraction is dominated by olivine and anorthitic plagioclase felspar whilst the clay fraction contains gibbsite and chlorite. General weathering reactions in the soil are discussed and the origin of the gibbsite is considered in detail.
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