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

cm large crystals. In the smaller cracks and cavities in dolomite rock, small rhombohedra of dolomite occur together with a little calcite. Accessory minerals are goethite, hematite, and rarely, barite. Around Pécsely a thin bed of a highly phosphatic sedimentary rock occurs in Triassic limestone in which some traces of uranium mineralisation have been found. Apart from the phosphate minerals fluorapatite and brushite, fluorite is also found in this assemblage. Traces of lead and copper mineralisation are known from a few quarries: galena and cerussite are the dominant lead minerals found at Sóly, and Liter, whereas at Balatonfüred chalcopyrite and tennantite, and azurite and malachite were found. The Jurassic sedimentary rocks are represented by limestones, fractures in which contain calcite and various manganese oxides. At two localities in these mountains manganese minerals were abundant enough and sufficiently concentrated to form ore deposits. The ore deposit at Eplény was mined from the 1930's to the mid 1970's. In this deposit, in addition to the oxide ore composed of the minerals romanechite, cryptomelane, pyrolusite, and manganite, quite a lot of fine grained manganese carbonate ore was present, including rhodochrosite, and manganoan calcite (Fig. 63). Particularly fine mineral associations were found in silicified tubercular ore types. Well developed crystals of pyrolusite and manganite appeared on the walls of cavities, often together with crystal groups of quartz, calcite, and rhodochrosite. The manganese ore deposit at Úrkút has been mined since the 1920's. Carbonate ores occurring here often have a ribbonlike structure. Their chief manganese minerals are rhodochrosite, and manganoan calcite with goethite and celadonite as accessory minerals which colour the ore brown and green respectively. Most of the oxide ore was derived from carbonate ore by oxidation. Main minerals of the tubercular ore type are romanechite, cryptomelane, pyrolusite, and manganite. Silicified ores with slightly different assemblages were formed later. In their cavities, quartz and well developed crystals of manganite and pyrolusite, calcite and rhodochrosite appear (Fig. 62).