Sopcheite, ideally Ag 4 Pd 3 Te 4 , is found in copper-nickel sulfide ores of the Monchegorsky Pluton, Kola Peninsula, USSR. Three grains of a mineral with similar characteristics, occurring in unusual intergrowths with kotulskite and merenskyite, were found in 1979 in a diamond-drill core from Lac-des-Iles, Ontario. Compositional and quantitative reflectance data.--Modified journal abstract.

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