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Cementing materials in the Arahama sand dune, Japan, were studied mineralogicaUy and biogeochemically to gain a better understanding of the cause of hardening. The cementing material is a clayorganic complex composed of noncrystalline gels and a matrix of small, poorly crystalline particles showing 14-16-~ spacings. The gel materials appear to have transformed into the poorly crystalline particles, which have a high carbon content and A1/Si ratios of 2.2 to 2.0. These particles are slightlydoi:10.1346/ccmn.1989.0370304 fatcat:bd3gbtsgjbc6pd6xdb54lmw7hu