Abstract
In their discussion of the paper by Einaudi (1968), Radcliffe and Mc-Sween (1969) have proposed, on the basis of crystal field theory, that solid solution of copper in pyrite is accomodated by a coupled substitution with arsenic. While the cuprian pyrites described by Frenzel and Ottemann (1967) and Einaudi (1968) both occur in enargite-bearing, arsenic-rich assemblages, analysis of pyrite from another locality indicates that some other mechanism must there have been responsible for the crystallization of copper-rich pyrite.
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