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

that, while the bituminous coal is eminently suitable for coking, it is very difficult to extract. This is because the deposits have a very complex structure and mechanisation is fraught with difficulty particularly now that the mines are being worked at depth. Some Cretaceous alkaline igneous rocks are also associated with these coal deposits. In these, in addition to the primary and secondary minerals reported earlier from other coal deposits in Hungary, is found analcime in fracture and joints. It is also found here in sedimentary septarian nodules and concretions. In cavities in these nodules, well developed crystals of many oxides (quartz, hematite), sulfides (galena, sphalerite, millerite), carbonates (calcite, siderite, dolomite, synchysite-(Ce), sulfates (barite, and celestine), clay minerals, and chamosite are to be found (Fig. 74). Fig. 73 AZURITE (7 cm sp) Pécs Cretaceous alkaline igneous rocks occur on the surface around Komló, Szászvár and Pécs. They are mostly potassium- and sodium-rich alkaline basalts, ankaramites or phonolites. The phonolites