pre-Alpine crystalline rocks of the Zemplinicum, occurring in the eastern part of Slovakia, has been subject of mineralogical and petrological investigation. In addition to the most common paragneisses, locally intercalated by amphibolites, they are represented by acidic- to intermediate orthogneisses, migmatites and granitoids. The index minerals of the paragneisses are biotite, muscovite (Si = 6.0–6.2 a./f.u), plagioclase (An_10-23), garnet (Alm_60-70, Prp_10-20, Grs_8-20, Sps_2-20), occasionally sillimanite, kyanite and staurolite. Apart from hornblende and plagioclase, some amphibolites also contain garnet. The metamorphic conditions, estimated using the dataset of Berman (1988) and standard geothermobarometers were 600–700°C at 550–850 MPa. Metamorphism culminated by granitoid magmatism. All metamorphic rock types and granitoids underwent varying degree of mylonitization (up to greenschist facies conditions).