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

for agricultural purposes. The mineral assemblage of this talc deposit may be summarised as follows: antigorite (Fig. 80), which is generally fibrous, fills joints in the serpentinite where it is more common than the talc which formed in compact and greasy masses along the serpentinite borders together with pale green and fibrous masses of tremolite. Pyrite, chalcopyrite, gersdorffite and pentlandite, sometimes with magnetite, ilmenite and chromite, are dispersed as clusters and individual grains throughout the serpentinite. Enormous masses of magnetite up to several hundred kilograms - are also occasionally found in the sepentinite, the fractures and joints in which may also be occupied by calcite, siderite, dolomite and magnesite. Quartz-calcite veins of a later hydrothermal origin have a different sulfide assemblage (galena, sphalerite, and stibnite) with large, several cm long crystals of quartz, calcite, and aragonite. Finally, a number of secondary minerals (goethite, malachite, jarosite and gypsum), are produced as a result of surface oxidation.