The spectral reflectivity of molybdenite was measured on an unpolished cleavage flake, a polished vertical section, and a polished basal section, both in air and in oil. From these measurements the refractive index and the absorption were calculated. Reflectivity peaks were found at 625 nm in air measurements and at 620 nm in oil measurements. Errors in reflectivity measurements made with a polarizing incident-light microscope were also considered. It was found that incremental (positive) errors are in general much higher than decremental (negative) errors.

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