Microstructure is a relative concept, and its range of microscopic scale generally spans at least several or dozens of atoms, ranging from about 1 nm to several tens of nanometers and even reaching a size of 0.1 mm (Zhu et al. 1994). According to the definition of material structure and the scale range of microstructure, the main contents of microstructural observation of mineral raw materials and mineral materials are as follows: there are two main ways of composition for mineral raw materials and mineral materials: single minerals and mineral aggregates, and the focuses of microstructural observation are different for them.