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White mineral coating joint-faces in quarries in the Northampton ironstone (Inferior Oolite) was long ago recorded as allophane. W. D. Herman who determined the mineral from the surface of a sandstone rock in a quarry opened in 1871 also analysed an unnamed white earthy mineral from crevices in the ironstone and obtained a composition close to that of fully hydrated halloysite. During the six-inch geological survey of that ironstone field in 1939–44 the occurrence of similarly situated whitedoi:10.1180/minmag.1950.029.208.03 fatcat:7bp4jq2fardcbhijitxshaflnu