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

爪哇岛古陆中有一种指示混层矿物的粘土矿物，它在风干时产生15.51Å峰(在14.61Å~16.37Å范围内)，在丙三醇溶液中产生20.55Å峰。在K~(++)饱和时，该矿物出现11.87Å的峰，且该峰一直持续到7.53Å。在连续升温过程中，该峰逐渐移动，最终在550时Å完全移至10.05℃。在饱和粘土中也观察到了7.53Å的峰值，当加热到550℃时，该峰消失。本研究的目的是研究该矿物的特征，060峰为1.5Å，表明该矿物为双八面体蒙脱石。对粘土样品的格林-凯利测试表明，这是一种贝氏陨石。甲酰胺的溶剂化作用使7.53Å峰膨胀到10.05Å，表明存在埃洛石。5M氢氧化钠处理导致7.53Å峰坍塌，并保持在15.51Å的锐峰(在饱和粘土中)。氢氧化钠萃取物的SiO_2/Al_2O_3摩尔比也支持卤石的存在。氢氧化钠处理还使K~+饱和粘土的11.87Å峰增加到13.49Å。根据粘土样品的矿物学和化学性质，我们认为该矿物是红柱石/镁橄榄石混合紫菜矿物。

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.