REGIONAL FEATURES OF CALCITE CRYSTAL MORPHOLOGY IN SOME DEPOSITS OF UKRAINE

Abstract

Calcite, along with quartz, is one of the most common minerals in nature. It participates in most geological processes. One of the defining typomorphic features of calcite is its crystallomorphological features. The crystallogenesis of the mineral from numerous deposits in Ukraine was once studied in detail mainly by Bohdan Zatsikha and Pavlo Vovk. We analysed in the proposed article the crystallomorphological features of calcite from a number of deposits in Ukraine, based on published, archival and our own data. In general, numerous simple shapes are found on the mineral crystals, such as the prism {10 1 0}, pinacoid {0001}, rhombohedra {10 1 1}, {01 1 2}, {02 2 1}, {20 2 1}, {04 4 1}, {40 4 1}, {05 5 2}. {10.0.10 .1}, {04 4 5},{08 8 1}, {13.0.13 .1}, {05 5 4}, scalenohedra {31 4 5}, {21 3 1}, {62 8 5}, {6.4.10 .3}, {10.4.14 .3}, hexagonal dipyramids {11 2 3}, {44 8 3}, {8.8.16 .3}, {7.7.14 .3}, {22 4 1}. It has been found that the shape of calcite polyhedra varies significantly depending on the region, genesis and physicochemical conditions of crystallization. Four habit types of calcite were identified from the junction zone of Donbass with the Azov Sea region, five from mercury deposits in Transcarpathia, three each from the Crimean Peninsula and sulphur deposits of the Pre-Carpathians. The presence of certain simple forms of calcite allows us to identify the region of its origin, as well as draw conclusions about the conditions of mineral formation, which has both genetic and applied significance for deposit exploration. The proposed work demonstrates the importance of combining classical methods of mineral research (goniometry, morphological and statistical analysis) with modern physicochemical methods such as thermobarogeochemistry, which allows for a more complete characterization of mineral matter. Directions and prospects for further research are outlined.