1. Choose a suitable microscope: usually choose high-resolution polarizing microscope or transmission electron microscope to observe and analyze mineral phases.
2. Sample collection: it is necessary to collect a slice of the silicon brick sample, grind it on the surface of the sample, and fix the slice on the microscope with a slice clamp.
3. Observing and analyzing the sample: observing the sample under a microscope, and measuring and determining the microstructure characteristics of the mineral phase by polarizing and rotating the sample. Tridymite and Fang Yingshi have different optical properties under the microscope, which can be observed and analyzed according to their different colors under polarized light and the rotation mode of diffracted light.
4. Record and express the results: record the observed microstructure characteristics, and describe and express them. It is necessary to extract characteristic indexes and quantify them in order to compare and analyze the structural differences of samples more accurately and objectively. Generally speaking, the microstructure analysis of tridymite and Fang Yingshi in silicon brick belongs to the research in the fields of geology and materials science, which requires some basic knowledge and experimental techniques such as physics, chemistry and materials science. For beginners, you can refer to the teaching materials and materials of geology, materials science and rock and mineral science for systematic study and practice.