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矿物的光性异向指数是作者基于Gladstone折射度的基础上提出的新概念,是研究结构光性矿物学时非常有用的。用光性异向指数可以导出原子团的极化率椭球,反之,已知矿物的晶体结构和原子团的方位及极化率椭球,便可以从理论上计算出光性异向指数来,从而还可以计算三个主折射率及光轴角。计算值和实验值符合得很好。例如,对碳酸盐矿物来说,计算方法和精确度都比Bragg的方法优越得多。当然,不仅对碳酸盐,而且对所有有强烈异向性原子团的矿物和化合物都是适用的。
The optical anisotropy index of minerals is a new concept proposed by the author based on the Gladstone’s refractive index. It is very useful when studying the structural phototopic mineralogy. Using the optical anisotropy index, the polarizability ellipsoid of the atomic group can be derived. On the contrary, knowing the crystal structure of the mineral and the azimuth and polarization ellipsoid of the atomic group, the optical anisotropy index can be calculated theoretically, Three main refractive indices and optical axis angles can be calculated. The calculated value is in good agreement with the experimental data. For example, for carbonate minerals, the method of calculation and accuracy are far superior to Bragg’s method. Of course, not only for carbonates, but also for all minerals and compounds with strongly anisotropic radicals are suitable.