Stratiform massive sulfide deposits. Complete substitution of Sb for As and substitution of Ag for half of the Cu. Ag substitution for Cu is a permissive function of the Sb-content remaining below 1 atomic percent when Sb is less than 10 atomic percent but rising to 18.6 atomic percent (= 29.5 weight percent) when Sb rises to 14.7 atomic percent. Tetrahedrite series minerals locally decompose to form a "graphic intergrowth" of arsenopyrite + or - gudmundite, sphalerite and chalcopyrite.--Modified journal abstract.

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