利用高分辨电子显微镜(HREM)研究了不同地质条件下生成的顽火辉石。[010],[012]取向结构象清楚地显示出单斜顽火辉石(CLEN)和正交顽火辉石(OREN)共生现象,其特征与Buseck和Iijima总结的规律相一致。陨石中的顽火辉石由于经受急冷,所以多型体共生现象出现频率最高。本文还详细地研究了在切应力作用下引起的OREN向CLEN转变及它们间的部分位错Burgers矢量,结果符合Coe提出的13.3°转变机制。 The pyroxene formed under different geological conditions was studied by using high resolution electron microscope (HREM). [010], [012] The orientation structure clearly shows the symbiosis of monoclinic heliotropy (CLEN) and orthorhombic (OREN), which is characterized by the generalization of Buseck and Iijima. The pyroxene in the meteorite is experiencing rapid cooling, so the occurrence of polytype symbiosis is the highest. In this paper, we also study in detail the OREN-CLEN transition caused by shear stress and the partial dislocation Burgers vector between them, which is consistent with the 13.3 ° transformation mechanism proposed by Coe.