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在广西德保多燕屯一带的上二迭系合山组煤系地层中,发现了规则混层矿物累托石,该矿物构成了极为罕见的炭质累托石粘土岩。文中提供了X射线衍射、红外、电镜、差热等资料。累托石的d_((001))=24.7A,经乙二醇饱和后变为26.8A,530℃加热后变为21A。矿物的化学成分是SiO_2 47.79,Al_2O_3 33.40,FeO+Fe_2O_3 0.034,MgO 0.10,CaO 1.98,K_2O 0.09,Na_2O 2.97,H_2O~+ 7.13,H_2O~- 6.13。推测该矿物是由钠质火山凝灰沉积物,于成岩-成煤作用期间,在一定的温度、压力下形成的。
In the coal measure strata of the Upper Permian Shijianshan Formation in the area of Duanyuntun, Debao, Guangxi, regular mixed-layer mineral rectorite was found, which constitutes a very rare carbonaceous rectorite clay rock. The article provides X-ray diffraction, infrared, electron microscopy, differential heat and other data. Rectorite d ((001)) = 24.7A, saturated with ethylene glycol becomes 26.8A, 530 ℃ heating becomes 21A. The chemical composition of the minerals is SiO 2 47.79, Al 2 O 3 33.40, FeO + Fe 2 O 3 0.034, MgO 0.10, CaO 1.98, K 2 O 0.09, Na 2 O 2.97, H 2 O + + 7.13 and H 2 O ~ - 6.13. It is speculated that the mineral is formed by the deposition of sodium volcanic tuff at a certain temperature and pressure during the diagenesis-coal formation.