Meta halloysite

According to Sudo [1963], one of the important occurrences is in the Kanto volcanic ash soils. The principal clay minerals are (meta) halloysite, hydrated halloysite, and allophane. Randomly interstratified halloysite-hydrated halloysite occurs in the lower horizons and gives a basal reflection consisting of a broad band sometimes or 7 A reflection tailed toward lower angles. 

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