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American Mineralogist; February 1983; v. 68; no. 1-2; p. 227-234
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Tetrahedrite-tennantite series compositional variations in the Cofer Deposit, Mineral District, Virginia

J. William Miller, and James R. Craig

Univ. Ga., Dep. Geol., Athens, GA, United States
Va. Polytech. Inst. and State Univ., United States

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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