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

sists of a cavity-filling zeolite assemblage, the best known localities for which are found in the northern Mátra in the region of Mátraszentimre, Tar, and Bátonyterenye (Fig. 37). Heulandite, chabazite, and mordenite are its most frequently encountered minerals. Fig. 37 HARMOTOME (0.6 mm xl) Fig. 38 QUARTZ, agate (17 cm sp) Bátonyterenye Gyöngyöstarján Most of the hydroquartzite rocks occur in the southern Mátra. Rarely, as at Asztag-ko Hill, these rocks contain a number of antimony oxides (valentinite, stibiconite, tripuhyite, and senarmontite) which formed as the weathering products of stibnite. In other areas, e.g., as at Nagytölgyes-bérc Hill, Jegy-kő brook the assemblage is dominated by quartz, barite and goethite. Another mineral assemblage is characteristic of a less extensive fracture-filling