Abstract
The Cu-Ag-S minerals, stromeyerite and mckinstryite, have been found for the first time in a stratabound polymetallic pyritic deposit in the Caledonides of central Norway. The surface specimens examined contained approximately 0.5% Ag, 1.8% Cu, 15.0% Zn and over 10 g/t Au and showed the mineral association pyrite, sphalerite, chalcopyrite, galena, tennantite, bornite, Cu-Ag sulphides, covelline, native Au, a Cu-Sn sulphide, and a new mineral of composition Ag5CuTeS2. The Cu-Ag sulphides appear to be replacing preexisting sulphides, with the exception of pyrite and sphalerite. The nature of this replacement is discussed. Analyses, by microprobe, of the Cu-Ag-S phases are reported and compared with published data. The stromeyerite shows an average composition Cu1.01Ag S, the mckinstryite Cu0.77Ag1.19S. Values are reported of the reflectance at 542 nm for both minerals. The data indicate that stromeyerite is optically positive with Rg: 30.7%, Rm: 27.3%, Rp: 25.8% while mckinstryite is negative with Rg: 32.5%, Rm: 31.9%, Rp: 27.6%.
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Bergstöl, S., Vokes, F.M. Stromeyerite and mckinstryite from the Godejord polymetallic sulphide deposit, central Norweigan Caledonides. Mineral. Deposita 9, 325–337 (1974). https://doi.org/10.1007/BF00206635
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DOI: https://doi.org/10.1007/BF00206635