We report here refined values of the transformation enthalpy for xanthoconite to proustite (54.81 kJ/mol) and pyrostilpnite
to pyrargyrite (40.32 kJ/mol). Additionally, the enthalpy for the transformation of trechmannite to smithite (5.82 kJ/mol)
has been determined. The refinement was possible by taking into account a previously unknown dependence of electrochemical
signals on the amount of substance undergoing the reduction process.
Received December 21, 1995/Revised, accepted June 29, 1996