(2) When the incident reflection angle is observed by the oblique reflection method, the incident angle is 30. ~ 45. It is appropriate. When observing, the incident angle and direction of the incident light should be changed to seek a favorable reflection angle, increase the amount of light entering the objective lens, and enhance the transparent visual perception under the mirror.
(3) Abrasives should avoid misidentifying the color of the abrasive deposited in the cracks and pits of the mineral film as the internal reflection color of the mineral.
(4) Interference phenomenon When white light is obliquely incident on colorless transparent minerals such as quartz and calcite , dispersion may occur like a prism, and interference may occur, so that the inside of the mineral shows "color". Do not strongly inject this internal reflection. The phenomenon of no internal reflection color is mistaken for the color reflection color.
(5) The objective lens multiple oblique method can only use the low magnification objective lens or the medium magnification objective lens. Because the working distance of the high signal objective lens is too short, the light is not allowed to be irradiated to the surface of the light film at a suitable angle. On the contrary, the orthogonal polarization method is preferably a high-power objective lens because the light absorbing by the high-power objective lens is strong, and the oblique light of various directions and incident angles increases the chance that the mineral exhibits internal reflection.
(6) Heterogeneous and polarized color homogeneous minerals can be observed by orthogonal polarization method in any direction, but the heterogeneous minerals show heterogeneity and polarized color under orthogonal mirror, so it should be in the extinction position. Correctly observe internal reflections. To distinguish between the internal reflection color and the polarized color, it is only necessary to rotate the stage. When the orientation of the mineral is changed, the internal reflection color does not change substantially, and the polarization color changes significantly.
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