Mikuš T., Bakos F. & Hönig S., 2019: Bismuth sulphosalts from the siderite–sulphidic and As-Co mineralization in Medzev area, Slovakia. Acta Geologica Slovaca, 11, 2, 91–102.

Bismuth sulphosalts from the siderite–sulphidic and As-Co mineralization in Medzev area, Slovakia

Tomáš Mikuš¹, František Bakos² & Sven Hönig³

¹Earth Science Institute, Slovak Academy of Sciences, Ďumbierska 1, 974 01 Banská Bystrica, Slovakia; mikus@savbb.sk
²Green View, s. r. o., Nevädzová 5, 821 01 Bratislava, Slovakia; fbakoss@yahoo.com
³European Cobalt Ltd., Hudcova 78C, 61200 Brno, Czech republic

Abstract

Two interesting associations of Bi minerals were found in the vicinity of the town of Medzev in the Slovenské rudohorie Mts. The first one occurs with quartz and arsenopyrite at Kobaltová vein and is represented by native Bi, bismuthinite, ikunolite, ingodite, benjaminite, matildite and gustavite. The second one was found at the Oriešok vein associated with pyrrhotite, arsenopyrite, cobaltite, sphalerite and galena. The sulphosalts identified there are izoklakeite, tintinaite, Bi-rich boulangerite and Bi-rich jamesonite. An extensive Bi³⁺ ↔ Sb³⁺ substitution was observed among studied sulphosalts. The Co anomalies, determined previously by geochemical methods, were explained by cobaltite and Co-rich arsenopyrite. Studied sulphosalts belong to the latest stages of the quartz-sulphidic mineralization in the Gemeric Superunit.

Key words: Western Carpathians, izoklakeite, matildite, gustavite, benjaminite, Bi-rich boulangerite and Bi-rich jamesonite

Manuscript received: 2019-06-18

Revised version accepted: 2019-11-18