Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 70. (Budapest 1978)

Noske-Fazekas, G. ; Embey-Isztin, A.: New data to the mineralogy of the basic intrusion around the village Szarvaskő, Hungary

Table 1. Mineral composition of the gabbros Plagioclase Pyroxene Amphibole Biotite, Chlorite Ore Other Gabbro Tardosbánya 44.9 26.3 0.6 9.0 12.5 6.7 Pegmatitic gabbro Tóbércbánya 54.7 24.8 10.1 3.0 1.7 5.7 Gabbro Tóbércbánya 54.6 20.9 8.1 7.0 2.4 7.0 so many tiny inclusions that the crystal becomes intransparent. Diallage is the most frequent mafic mineral in the Tóbércbánya gabbro, too. The parting according to (100) is less developed and it can only be seen in the central parts of the grains (Plate IV: 1). The amount of the generally chloritized brown amphibole is significant (Table 1). The quantity of biotite increases as well, and that of the apatite remains small. Among the secondary minerals calcite, chlorite, titanite, quartz may be mentioned (Plate IV: 2). In the gabbro of Tóbércbánya there are some irregularly shaped pegmatitic nests with large plagioclase, amphibole, clinopyroxene and minor quartz crystals. Fig. 2. Frequency distribution of plagioclase feldspar twins, A = Tardosbánya, B = Tóbércbánya. — Key: l = albite, 2 = Manebach, 3 = Baveno, 4 = Carlsbad, 5 = acline , 6 = Ala, 7 = albiteCarlsbad, 8 = albite-Ala