雲母粘土鉱物のX線底面反射パターン,特に含NH₄雲母鉱物の特徴について

抄録

X-ray basal reflections of ammonium-bearing mica clay minerals found in the Tobe pottery stones of Ehime Prefecture have been examined in comparison with those of usual potassium mica clay minerals. Both the two mica clay minerals comprise mica and mica/montmorillonite interstratified minerals. The minerals with ammonium are characterized by larger basal reflection spacings and stronger first basal reflections than those of potassium mica minerals, which can be attributed to the interlayering of ammonium ions in place of potassium ions. The differences in basal reflections between the two mica clay minerals are well represented in I (10 Å)-I (5 Å)-I (3.3 Å) and W₁-W₂ (peak widths of about 10 Å and 5 Å reflections) diagrams.