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

gypsum occur most frequently with smaller amounts of the phosphates wavellite, crandallite and variscite. Minute amounts of gold and silver tellurides were also detected in pyrite at Hegyes Hill. In the 1970's an entirely different ore formation was found at Recsk. This so-called porphyry copper ore and skarn formation was explored by drilling to a depth of more than a thousand meters. Mining the rich and fairly widespread ore formations occurring in Eocene andésites and Triassic sedimentary rocks and along their borders is not economically viable at present. Most of these ores are disseminated (porphyritic) or are skarns and are of great interest to mineralogists. The skarns have a particularly varied mineral assemblage including garnets, hedenbergite, wollastonite, epidote and serpentine minerals. Three major types of copper ores are recognised in this association: chalcopyrite-pyrite, chalcopyrite-pyrite-magnetite and chalcopyrite-pyrite-pyrrhotite. Quartz veins in the porphyry copper ores also contain a fair amount of molybdenite. In addition to the most important disseminated ore bodies (this copper-bearing rock mass measures about one and a half cubic kilometers), the andésites contain ore-bodies rich in sphalerite, pyrite, and chalcopyrite. The near-surface stockworks containing enargite-luzonite at Lahóca Hill may indeed be regarded as a late stage hydrothermal off-shoot of the above mentioned massive ore body. In the recent precipitations is found some interesting minerals e.g. dypingite, northupite, blödite, nesquehonite, bonattite, and sideronatrite. Another entirely different hydrothermal lead-zinc ore formation, linked to Miocene volcanic rocks, is found in the central and western parts of the Mátra. Its mineral assemblage and appearance differ from those described so far. Twenty quartz veins were found between Gyöngyösoroszi and Mátraszentimre - running along a line of brecciated and weathered volcanic rocks. The biggest of these was the Károly vein, roughly 1.5 m thick and about 900 m long. The lodes were first recognised and worked in the 18th century around Gyöngyösoroszi but it was not until the beginning of the 20th century that mining started in earnest. Ores extracted up to the mid 1980's were dressed locally but smelted abroad. Sphalerite, galena, chalcopyrite,