Along the Balaton-Velence fault zone there are a few hypabyssal, small, Variscan (280 mil.years) S-type granitic intrusions. Only one outcrop on the surface is in the Velence Mts. This monzogranite crystallized from a nearly eutectic water-saturated melt at approximately 680 °C, 200 MPa. The granite contains basic magmatic enclaves, metapelitic xenoliths, and fayalite-bearing pegmatitic nests. The basic enclaves represent a primitive magma, with evidence of alteration by the enclosing granitic melt. The metapelitic xenoliths were embedded from the former andalusite hornfels, recrystallized and partially fused in the granitic melt at a pressure and temperature similar to the enclosing granite. The fayalite-bearing pegmatitic nests crystallized at lower temperature (540 °C, 200 MPa) in the upper part of the granite intrusion. Due to the falling temperature and metapelitic xenoliths, locally the oxygen fugacity decreased and quartz, fayalite and K-feldspar crystallized instead of annite-rich biotite.