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

Fig. 41 OPAL, wood opal (14 cm sp) Fig. 42 SAL AMMONIA C (1.5 mm xl) Nógrádszakái Bátonyterenye In general, however, these mountains have a rather poor hydrothermal and autopneumatolitic assemblage, the best examples of which are to be found in Miocene andésites. Calcite, ankerite, and pyrite are the dominant minerals in the andésites of the Karancs mountains. These are associated with minor amounts of barite, quartz, adularia, goethite, and aragonite. A somewhat different mineral assemblage of siderite, aragonite, and tridymite occurs at Sámsonháza, whereas in the cavities of the quarry Zsunypuszta, near Nagylóc the carbonates are of secondary importance compared with the rock-forming minerals (hornblende, plagioclase, ilmenite and zircon). Traces of metallic minerals occur in veins in several andésite outcrops, the