Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 3. 1972. (Budapest, 1972)
On the whole optical properties of 75 orthoclase, 40 plagioclase twin, and 28 hornblende crystals have been determined. Quantitative mineralogical composition of dike rocks The volume-content of essential minerals has been determined by means of an integrating stage (Table 1-3.). The mineral composition is variant, the central part of dikes is more abundant in mafic constituent s .Considering •that the number of inclusiens is smaller in the central part, this part can therefore be regarded as characteristic of the whole dike. The modes of samples originating from central parts, and those of average samples are demonstrated in table 4. Plagioclase is the most frequent mineral of the dike rocks. Its amount is roughly the same in the Sárhegy and the Csala Forest dike, and it is less in the Székesfehérvár Quarry dike. Orthoclase is also a common constituent. The smallest amount of orthoclase is in the Sárhegy dike, there is some more orthoclase in the Csala Forest dike, and much more in the Székesfehérvár Quarry dike. Hornblende is the dominant mafic constituent in the Sárhegy dike but a smaller amount of biotite also occurs. In the central part of the Csala Forest dike there is some more hornblende than biotite, whereas in the average composition of the dike biotite exceeds the amount of hornblende. In the Székesfehérvár Quarry dike biotite is the only dark constituent. Quartz is present in all the dikes. In the Székesfehérvár Quarry and the Csala Forest dike the amount of quartz is high(about 20%), whereas there is much less quartz in the Sárhegy dike. As to accessories, the dike rocks contain apatite, zircon, titanite, diopsidic augite, magnetite and fluorite.
