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

THE VISEGRÁD MOUNTAINS On the western side of the mountains on Lencse Hill, near Esztergom there is an Eocene coal deposit which is still worked today. The tunnels and galleries of this deposit revealed not only sedimentary rocks but Miocene andésites. A relative rich mineral association was found in this mine with some first-class crystal groups of calcite, barite, marcasite, and pyrite. Fig. 47 CHABAZITE, phocolite (6 cm xl) Dunabogclány The Visegrád mountains - like the Börzsöny mountains - consist largely of Miocene andésite and andésite tuffs (they are separated only by the Danube). During the main period of crystallisation, large crystals of plagioclase and horblende were formed. At a number of places in these volcanic rocks exotic inclusions (xenoliths) of sedimentary and metamorphic origin were found. At the