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

and rarely some fluorite. Superb specimens of crystal groups of calcite and barite were found long ago in Budapest on Kis-Sváb Hill and on Mátyás Hill. On Róka Hill in Budapest an interesting mercury mineralisation was found with metacinnabar and cinnabar (Fig. 51). Here too, splendid pyrite groups occur in the argillaceous rocks. Pretty calcite and barite crystals occur in fractures and joints in the sandstone near Üröm, and Pilisborosjenő. Caves developed in the limestones contain relatively few mineral species (calcite, barite, gypsum, aragonite, goethite) but those that do occur do so in a wide variety of habits, particularly so in the caves of the Buda and Pilis mountains. Goethite, pseudomorphous after marcasite, is common in some quarries of the Oligocène Buda marls. Tertiary and Quaternary clays were once extracted from pits particularly at Budapest, by a number of brickworks. Splendid crystal groups of gypsum, with marcasite and pyrite were found there.