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

semblage, particularly at the now abandoned quarry at Nadap. Here, in vesicles and blow-holes, the zeolites levyne, stellerite, heulandite, laumontite and chabazite are accompanied by fluorite, epidote, and pyrite. In hydroquartzite, formed as a result of late volcanic activity, in the area of Pázmánd, interesting mineral associations were found during a drilling program: apart from major quartz, quite a lot of pyrophyllite, kaolinite, and some hematite, goethite, alunite, zunyite and topaz was present. In other boreholes near Pázmánd, again linked to Eocene magmatic rocks a skarn type association (epidote and andradite) was discovered. A little further west at Polgárdi, as a result of mining on Szár Hill, these skarn rocks can be seen on the surface at the contact of the Eocene andésites and Paleozoic limestones. Occasionally, blocks of several hundred kilograms are found. The dominant minerals are vesuvianite, wollastonite and diopside, together with some apo-phyllite, okenite, and thaumasite (Fig. 59 and 60). Hydrothermal lead ores, again linked to Eocene andésite, occur to the West on Szár Hill near Szabadbattyán. This high quality ore was mined between 1938-54. Mining research has shown that these surface deposits of lead ore were already known by the Romans and used by them for their lead water pipes and aqueducts. Galena is the chief primary mineral, but following oxidation near the surface, considerable amounts of cerussite were formed too, together with minor amounts of malachite, cuprite, pyromorphite, smithsonite, fornacite, and bindheimite.