Szakáll Sándor - Jánosi Melinda: Minerals of Hungary (Topographia Mineralogica Hungariae 4. Miskolc, 1996)

taibel identified the element tellurium. Most of the few remaining specimens of the ore are bismuth tellurides (pilsenite, tetradymite, joséite-A, and joséite-B), no new specimens have been found since, and it is not even known where exactly the original specimen was found. This ore, centred on Rózsa Hill, was formed in two stages. Pyrrhotite, chalcopyrite, and sphalerite are the chief minerals of the assemblage formed at high temperatures. Characteristic minerals of the second stage are arsenopyrite, pyrite, galena, bismuth, and bismuthinite (Fig. 45). During this stage a number of rare bismuth sulfides including emplectite and lillianite were formed. Small amounts of the tungsten minerals (ferberite, hiibnerite, and scheelite) have also been found here. From primary minerals found near the surface, a very varied oxidised assemblage was formed including a number of arsenates (scorodite, arseniosiderite, kankite and segnitite; Fig. 46) and arsenic oxides (arsenolite and claudetite). Because of the large number of elements present in this ore its mineral assemblage is probably the most varied in the country (about 80 mineral species have been identified to date, though many appear only in microscopic quantities). Metallic traces can be found at many localities all over these mountains, such as the sulfide mineralisation at the Bezina adit, and the Alamizsna adit near Nagyirtáspuszta, Nagybörzsöny. Some 'porphyry copper' indications of a different origin, accompanied by magnetite, have also been found at Perőcsény in valley of the Kuruc brook. Smaller iron ore deposits are found near Szokolya hosted by Tertiary sedimentary rocks. Several foundries and forges were estab-lished during the 18th century in this area and used the iron ore obtained from numerous pits and adits. Several 'alluvial' minerals, e.g., almandine, grossular, augite, co-rundum, quartz and apatite were derived from weathering of the igneous rocks and their inclusions, very well developed crystals of these minerals can still be seen in placers at Marianosztra, Nagybörzsöny, Kóspallag and Verőce. Opalised (silicified) wood remains found in Miocene gravel deposits surrounding these mountains are known from more than one quarry.