Study on the characterization of a unique smectite disconvered in soil of Java Island

爪哇岛古成虫中有一粘土矿物，为混合层矿物，在Mg^<2+> -空气干燥时出现15.51Å峰（在14.61Å和16.37Å范围内），在Mg^<2+> -甘油溶剂化时出现20.55Å峰。在K^+饱和度上，矿物呈11.87Å峰，该峰连续至7.53Å。在连续加热过程中，x射线衍射（XRD）峰逐渐移位，最终在550℃时完全移至10.05Å。Mg^<2+>-和K^+饱和黏土均存在7.53Å峰值，在550℃加热后消失。本研究的目的是研究这种矿物的特性。060峰为1.50Å，提示为双八面体蒙脱石。黏土样本的格林-凯利测试表明是贝德尔陨石。甲酰胺溶剂化导致7.53Å峰膨胀至10.05Å表明高岭土的存在。5M NaOH处理导致7.53Å峰值坍塌，保持在15.51Å的尖峰处（在Ms^<2+>-饱和粘土中）。NaOH萃取物的SiO_2/Al_2O_3摩尔比也支持了卤石的存在。NaOH处理也使K^+饱和黏土的11.87Å峰增加到13.49Å。根据黏土矿样的矿物学和化学性质，认为该矿物为玄武石/贝德尔石混合紫菜矿物。

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 14.61Å and 16.37Å) on Mg^<2+> -air dry 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.Futhermore, on sequential heating, the peak gradually shifted and finally shifted completely to 10.05Å at 550℃ in X-rav diffraction (XRD). A peak of 7.53Å was also observed in both Mg^<2+>- and K^+-saturated clays which disappeared after heating at 550℃. 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 neak of 15.51Å (in Ms^<2+>-saturated clay). The presence of hallovsite 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 properties of the clay sample we consider that the mineral is hallovsite/beidellite mixed laver mineral.