Abstract
IT would appear that there may have been some ambiguity in the use of the terms ‘standard reference surfaces’ and ‘standard values’ in our recent article on the above subject1. The standard reference surfaces specifically refer to a polished basal section of quartz and to liquid mercury under a coverslip, which were measured for us by the National Physical Laboratory. The intention was that these two surfaces would be readily reproducible by other workers. The confusion has arisen in that two other surfaces of intermediate reflectivity were also measured for us by the National Physical Laboratory to assist in the calibration of our equipment. It is entirely incidental that these two ‘other surfaces’ were hæmatite and pyrite; their identity is immaterial and the values of reflectivity quoted for them are not standard values, sensu stricto, since minerals will, in many cases, show a range of reflectivity due to variable composition and optical anisotropy.
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Nature, 187, 282 (1960).
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GRAY, I., MILLMAN, A. Spectral Reflectivity of Ore Minerals. Nature 188, 1100 (1960). https://doi.org/10.1038/1881100a0
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DOI: https://doi.org/10.1038/1881100a0
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