中国江西省楽平市産セピオライトについて

概要

論文の詳細を見る
The upper Paleozoic series are widely distributed in the western part of Jiangxi Province, China. The sepiolite-bearing clay occurs as thin beds in the cherty limestone of the lower Permian series near Leping City. These sepiolite beds are recognized as the most important deposit in China. The X-ray diffraction pattern of the purified specimen clearly indicates that this material is an well crystallized α-sepiolite with a small amount of talc. The structural formula calculated on the basis of 32 oxygens in the half-unit cell of dehydrated sepiolite is as follows : (Si_<11.59> Al_<0.41>)_<12> (Al_<1.42> Fe^<3+>_<0.41> Mg_<5.36>)_<7.19> O_<32>・Ca_<0.02> Na_<0.03>K_<0.12> This specimen may be specified as aluminian sepiolite characterized by high content of aluminum. Mineralogical data such as TG-DTG-DTA curves, IR spectra, SEM and TEM, etc. are also presented. In the light of the mode of occurrence, the sepiolite has been primarily formed as β-sepiolite of marine origin, and then changed to α-sepiolite in subsequent diagenetic process.
日本粘土学会の論文
1988-09-01