Abstract
THE practical difficulties of the direct determination of the indices of refraction and absorption of the opaque ore minerals have resulted in little work in this direction being accomplished. The progress of ore microscopy, however, has established the measurement of the reflectivity for (nominally) vertically incident light, whether by visual photometry as developed by Berek1 and Schneiderhöhn, or by a photoelectric ocular as developed by Orcel2, as a routine process in the determination of these minerals. The figures obtained present evidence of certain regular relationships. Thus, amongst the simple sulphides, selenides and tellurides a general increase of reflectivity with increasing atomic number can be traced in such series as ZnS–CdS–HgS or PbS–PbSe–PbTe.
Similar content being viewed by others
Article PDF
References
Z. Krist., 77, 1–22; 1931.
Bull. Soc. franc. Min., 53, 322; 1930.
Ibid., p. 302.
Z. Krist., 77, 108; 1931.
"Lehrbuch der Erzmikroskopie", Band 2, Berlin, 1931.
Z. anorg. Chemie, 15, 173; 1897.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
COLES PHILLIPS, F. Calculation of the Reflectivities of Sulphide Ore Minerals. Nature 130, 998 (1932). https://doi.org/10.1038/130998a0
Issue Date:
DOI: https://doi.org/10.1038/130998a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.