The Commission on New Minerals and Mineral Names (hereafter abbreviated as CNMMN)of the International Mineralogical Association was established in 1959 for the,purpose of controlling mineral nomenclature. All proposals for introducing new minerals,, changing mineralogical nomencla-ture,and discrediting or redefining existing minerals and mineral names should be submitted to the CNMMN for approval before publicatioa.If approval is withheld,the proposal should not be published. This report inoorporates material from previous repprts onmineral nomenclature and procedures of the CNMMN (Fleischer, 1970，Donnay & Fleischer, 1970;Embrey & Hey,y, 1970; Hey &Gottardi 1980; and Mandarino et al., 1984), and represents an attempt to consolidate this information and to present a comprehensive summary of the subject. Where there are differences between this report and the earlier ones, this version is to be regarded as the borrect one.