CHARACTERIZATION OF KAOLIN/SMECTITE MIXED LAYER MINERAL IN PALEUDULT OF JAVA ISLAND

概要

論文の詳細を見る
In a Paleudult of Java Island, there was a clay mineral indicating a mixed layer mineral which gave 15.51Å peak(in the range of 14.63Å and 16.37Å)on Mg^<2+> -airdry and a 20.55Å peak on Mg^<2+> -glycerol solvation.On K^+ -saturation, the mineral showed an 11.87Å peak and this peak was continuous to 7.53Å.Furthermore, on sequential heating, the peak gradually shifted and finally shifted completely to 10.05Å at 550°C in X-ray diffraction(XRD).A peak of 7.53Å was also observed in both Mg^<2+> and K^+ -saturated clays which disappeared after heating at 550°C.The objective of this study was to investigate the characteristics of this mineral.The 060 peak was 1.50Å and suggests the dioctahedral smectite.The Greene-Kelly test on the clay sample suggests beidellite.Formamide solvation that caused a swelling of the 7.53Å peak to 10.05Å suggests the presence of halloysite.The 5M NaOH treatment resulted in a collapse of the 7.53Å peak and remained at a sharp peak of 15.50Å(in Mg^<2+> -saturated clay).The presence of halloysite was also supported by a SiO_2/Al_2O_3 molar ratio of NaOH extractable materials.The NaOH treatment also resulted in an increase of the 11.87Å peak(in K^+ -saturated clay)to 13.49Å.According to the mineralogical and chemical peoperties of the clay sample we consider that the mineral is halloysite/beidellite mixed layer mineral.
日本粘土学会の論文