Mesonorm is a norm calculation scheme from whole-rock chemical analyses of igneous or high grade metamorphic rocks. Compared with the widely used CIPW norm scheme, a major improvement of the mesonorm scheme is introducing the biotite (Bi) norm in its calculation procedure. Thus, the mesonorm scheme produces less content of K-feldspar (Or) norm and more content of quartz (Q) norm for most igneous and high grade metamorphic rocks. Consequently, the mesonorm provides a more realistic estimation of the K-feldspar content in the rocks. In this paper, the procedure of mesonorm calculation is presented briefly, and several case studies are provided to validate the advantages of the mesonorm as a tool for normative calculations. For the naming and classification of the mica contained plutonic rocks, the norms by mesonorm calculations project into the right places of the QAP and the Q’-ANOR diagrams, while the CIPW norms performs badly in the cases. The mesonorm projections of five categories of granitoids, which are defined by the chemical-mineralogical criteria, illustrates distinguishable patterns in the Q’-ANOR diagram among the five categories. This finding suggests that the mesonorm projected Q’-ANOR plot is a potential scheme to identify the chemical-mineralogical categories of granitoid suites and discriminate their tectonic environment. The bulk rock densities of the intermediate- and high-grade ortho-metamorphic rocks in eastern China, which are derived from the rock-forming mineral portions by mesonorm calculations, demonstrate a good correlation with their bulk SiO₂ contents, which is SiO₂ (wt%) = -69.069 × ρ + 259.741 (the unit of density ρ is 10₃^kg/m₃⁾. Thus the bulk SiO₂ content of the lower crust of eastern China is estimated to be less than 53 wt%, and implies a basic composition in chemistry. In summary, we argue that the mesonorm provides more suitable norms than the CIPW norms for common igneous and high-grade metamorphic rocks. However, the public softwares for mesonorm calculation are still lacking, and more programming works are needed.