Abstract
IT has been accepted that, in general, the principal clay mineral in so-called bentonite and acid clay from Japan is montmorillonite. This fact is generally true, but closer examination has shown that these clays are, in general, very complex with regard to their mineral components. Recently, we have found certain clays closely associated with acid clay deposits and showing unusual properties; moreover, such clays are not so rare as we have hitherto anticipated. The purpose of this communication is to discuss the general mineralogical properties of such clays as illustrated by two representative reference specimens (Awazu and Nata clays from Ishikawa Prefecture) selected as samples which are as free from impurities as possible.
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