The azimuth of vibration of plane-polarized light falling obliquely on a polished surface is rotated on reflection. This rotation can be measured with a conventional ore microscope calibrated for the purpose, giving the refractive index of transparent isotropic minerals within 0.0S. Use of a compensator for measuring the ellipticity of the reflected light in the polarization figure yields a rapid method for approximate determination of the absorption and refractive indices of opaque minerals. These data may aid mineral identification during routine examination of polished ores.

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