Abstract
We would like to thank Dr. A. H. Clark for pointing out additional data on the problem of the inclusion of copper in pyrite. The hydrothermal experimental data described by Shimazaki (1969) suggest that there is extensive solid solution between CuS2 and FeS2 at 225°C. However, pyrite and chalcopyrite are common mineral associates yet cuprian pyrites are rare. As predicted from crystal field theory (Radcliffe and McSween, 1970), solid solution of CuS2 and FeS2 is essentially limited in the natural system.
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