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由于具双晶的酸性(An_(0—30))斜长石所发育的双晶多半为钠长律,而这类斜长石的Np与钠长律双晶轴⊥(010)的夹角均近于或等于90°,所以经典的双晶法对于酸性斜长石的鉴定往往效果较差,尤其是对有序度的鉴定,效果更差。 鉴于酸性斜长石分布的广泛性及其在研究花岗质岩石中的重要性,为改进酸性斜长石的鉴定方法,笔者设计了一个基于光轴角2V及光性方位数据Nm∧⊥(010)的新方法。此法与笔者之一提出的基于三个消光角
Since the twin formed by the acidic (An_ (0-30)) plagioclase is mostly sodium, the angle between the Np of such plagioclase and the tetragonal twin ⊥ (010) Both close to or equal to 90 °, so the classic twin crystal method for the identification of acidic plagioclase is often less effective, especially for the identification of degree of order, the effect is even worse. In view of the extensive distribution of acidic plagioclase and its importance in the study of granitic rocks, in order to improve the identification method of acidic plagioclase, the author designed a method based on optical axis angle 2V and optical orientation data Nm∧⊥ 010) the new method. This method with one of the authors is based on three extinction angles