Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 3. 1972. (Budapest, 1972)
axial angles is 69°. Hornblende crystals belonging to the second generation form pale green needles of 180-240 size. Generally biotite has smaller size than hornbl ende ,and it forms euhedral hexagonal plates in some cases (Plate 3« Pig. 4»). Chloritization both of hornblende and biotite is a common phenomenon. Other mineralogical constituents. In the neighbourhood of dark silicates altered to chlorite, titanite may occur as an accessory. It forms anhedral crystals of 100-800 A* size (Plate 1. Pig. 3, 4.). In some cases it shows mosaic structure as well as twinning. Titanite is obviously a secondary mineral here. The S'rhegy dike is the most abundant is secondary titanite. Apatite crystals of 150-200^ size are relatively common (Plate 2. Pig. 2. ). Zircon present .in small amounts forms euhedral crystals (Plate 2. Pig. 1.). Anhedral crystals of fluorite are very scarce. They were formed by submagmatic processes. (Fluorite abundant in some varieties of the Velence granite is of similar origin. ) The amount of opaque minerals is insignificant. The occurrence of titanite, diopsidic augite and fluorite is not mentioned in works of earlier authors. Discussion The quantitative mineralogical and chemical composition of the Velence dikes of basic character vary over a fairly wide range, yet their close relationship is undoubted.This fact is favoured
