Mineralogical study of weathering products of granodiorite at Shinshiro City (V)

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Abstract
In the foregoing papers (15, 16) of this series of studies, a conspicuous 14 A reflection was found in X-ray diffractograms for the weathered brown and yellow micas, and for the silt and clay fractions. It was thought to be due to “Al-vermiculite”, which has a trioctahedral character but upon chemical and thermal treatments behaves like “dioctahedral analogue of vermiculite” (2). It was also noted that contraction of the reflection to a 10 A sparing is more difficult when the specimen examined is fine in particle size and is taken from a high horizon (16).

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