SU Xiao-li1,2,3, WU Xiao1,3, CHEN Qing-ze1, MA Ling-ya1, LIANG Xiao-liang1, TAO Qi1, ZHU Jian-xi1, HE Hong-ping1,3*
(1.Guangdong Provincial Key Laboratory of Mineral Physics and Material/CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
2. School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract: The crystal chemical characteristics of the Lingshou vermiculite, a mineral defined by using XRD, in Hebei Province are significantly important for its development and application. In this work, the XRD, XRF, FTIR, and TG-DTG techniques are applied to study mineralogical characteristics including mineral composition and crystal structure of the purified vermiculite samples in Lingshou County, Hebei Province. On the basis of above works, the effects of crystal properties on the hydration behavior of vermiculite have been investigated by controlling conditions of different relative humidities. The results show that the Lingshou vermiculite is a trioctahedral one with the interlaminar hydration cation of Ca2+ and average layer charge of 0.61 eq/O10(OH)2 (half unit cell). The inhomogeneous charge distribution between different crystal layers is represented by a certain amount of K+ contained in partial interlamination. The d002 values of vermiculite samples, which have weak expandability, vary with the variation of ambient humidities.
Keywords: Lingshou; Vermiculite; Crystal chemistry; Interlaminar hydration
ACTA MINERALOGICA SINICA Vol. 39, No. 6, 2019, page 673-680
