Abstract: This paper introduces a quantitative analysis method of mineral components of rock and motes in formation by x-ray diffraction. The principle of the analysis is based on intra-standard and extrastandard equations. The strength factors of minerals are determined in author s experiments. The analysis is simple and feasible, and its accuracy can demand the needs of petrology study and core analysis.

Key words: X-ray diffraction, Intra-standard method, Extra-standard method, Strength factor, Analysis of mineral components of rock, Analysis of motes in formation, Basic effect