YAN Wen-chang 1.2, WU Da-qing1, YUAN Peng 1, CHEN Min 1, LIUDong 1, ZHANJian-hua 3, TAN Dao-yong 1.2
(1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;
3. China Building Materials Industry Geological Exploration Center Anhui Branch, Hefei 230009, China)
Abstract: Structure changes of Mg-rich palygorskite from Mingguang, Anhui Province, China, and Mg-poor palygorskite from Xuyi, Jiangsu Province, China under heatingwere investigated. Compared with the Mg-rich palygorskite, Mg-poor palygorskite has continuous vacancy in ribbons and shows low symmetry of octahedron ribbon, high structure stability, high degree of crystallization, and high thermostability. During the removal of bound water and dehydroxylation, Mg-rich palygorskite changes from orthorhombic structure into monoclinic structure, and shows deformation and collapse of channels, but keeps layered structure and crystalline characteristic; Mg-poor palygorskite exhibits the structural folding, gradual damage of layered structure and polycrystal properties, and appears amorphous characteristic because of the damage of tetrahedron ribbons when heating at 700 ℃.
Key words: palygorskite; heating; thermostability; degree of crystallization; crystal structure
E-mail: yanwenchang@gig.ac.cn
ACTA MINERALOGICA SINICA Vol. 32, No. 4, 2012, Page 475-480
