The relationship between the major axis of the light-emitting body and the crystal axis of the crystal is called the optical orientation. The optical orientation varies depending on the crystal system to which the crystal belongs. The optical orientation of the intermediate crystal: the monoaxial crystal is a spheroid whose axis of rotation (optical axis) is consistent with the higher-order symmetry axis of the crystal [Fig. 2-8-8]. Light of the lower crystal Sexual orientation: The biaxial crystal light body is a triaxial ellipsoid with three mutually perpendicular quadratic symmetry axes (spindle), three symmetry planes (spindle surface) and one symmetry center. The symmetry element is equivalent to orthorhombic The symmetry element of the system [3L23PC]. Therefore, the optical orientation of the orthorhombic system is such that the three principal axes of the illuminating body coincide with the three crystal axes of the crystal. Which one of the major axes corresponds to which crystal axis, depending on the mineral Different (Fig. 2-8-9a). The symmetrical element of the monoclinic crystal is that the L2PC.y crystal axis is the quadratic axis of symmetry, the y axis coincides with one of the three major axes of the light body, and the other two principal axes and the crystal axis Oblique. Which one of the main axes is consistent with the y-axis, and how much the other two main axes are oblique to the crystal axis, depending on the type of mineral (Fig. 2-8-9b). The symmetry of the triclinic system is the lowest, only one symmetry The center is equivalent to the symmetrical center of the light body. Therefore, the optical orientation of the triclinic crystal is the three main elements of the light body. 
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