In this paper three diagrams determined the compositions of clinopyroxenes with X-ray powder method are plotted by the present authors according to a great deal of data for the synthetic and natural specimens (incluses new seven analyses). The three diagrams are as follows:1) the universal diagram for all clinopyroxenes using 2θ510 and 2θ50 (Cu Kα) (Fig. 1);2) the diagram determined the composition of the clinopyroxenes in the system Ca-Mg-Pe using 2θ(311)-2θ(310) Cu Kα and d150 (Fig. 2);3) the diagram determined the clinopyroxenes in the system of Jd-Ac-Di-Hd using d150 and refractive index α (Fig. 4).A linear relation between the volumes of unit cell of clinopyroxenes and the mean radii of cations also is given.
. 1975, 单斜辉石的 X 射线粉末法研究. 地质科学, 10(2): 132-149.
. A STUDY OF CLINOPYROXENES BY X-RAY POWDER METHOD[J]. Chinese Journal of Geology, 1975, 10(2): 132-149.