摘要:Dickite as a type of clay mineral that is utilized in industries such as papers, ceramics, paints, cosmetics and fillers is widely distributed in Zijinshan (ZJS) Au-Cu deposit in southeastern China. In this paper, three types of dickites (i.e., transparent, translucent and opaque), which were selected by optical microscopy, were investigated by X-ray diffraction (XRD)-Rietveld method based on the EVA and TOPAS softwares. The results show that transparent dickite is lowly ordered and poorly crystallized. Compared to other two dickites, the transparent one has a lower value of DC in-dex and thinner average flake thickness alongc-axis. Furthermore, the crystal structure of transparent dickite has a greater number of distortions of [SiO4] tetrahedron and [AlO6] octahedron, compared to that of translucent and opaq-uedickites. The results by the XRD-Rietveld method were confirmed by field emission scanning electron microscopy (FESEM) and electron probe micro-analysis (EPMA). Therefore, transparent dickite with low degree of order and ir-regular particle shape is not suitable for use in ceramic industry.