Vovk O. Crystal Morphology of topaz and beryl of chamber pegmatites of Korosten pluton (north-western part of the Ukrainian Shield)

Object of study-topaz and beryl from the different mineralogical-structural zones of chamber pegmatites of Korosten pluton. The main aim of thesis is to perform comprehensive systematic studies of crystal morphology of topaz and beryl from the different mineralogical-structural zones of chamber pegmatites of Korosten pluton, to explain the determination of influence of structural factors and terms of formation on the form of polyhedrons of those minerals. Large, statistically significant number of crystals of topaz from chamber pegmatites of Korosten pluton has been researched goniometrically. The differences between the polyhedrons of topaz and beryl from the different mineralogical-structural zones of chamber pegmatites of Korosten pluton have been clearly fixed. The influence of structural factors on crystal morphology of topaz and beryl polyhedrons has been investigated.The fact of simplification of crystal morphology of topaz and beryl in the process of crystallization with falling of temperature have been proved.