Caracterización y descripción de minerales opacos bajo el microscopio petrográfico

Abstract

Abstract: In the present investigation, a microscopic description and characterization was carried out. of opaque minerals from different localities and localized mineral deposits in the Southern Region of Ecuador. This study involved the preparation of 9 polished sheets (briquettes) where 13 different minerals were identified among native elements (gold), oxides (magnetite, pyrolusite, hematite and goethite) and sulfides (pyrite, pyrrhotite, chalcopyrite, sphalerite, galena, arsenopyrite, molybdenite and antimonite). The properties were determined optics of each mineral with parallel nicols (without analyzer): color, pleochroism and reflectance; as well as the properties with crossed nicols (with analyzer): anisotropy and internal reflections. In addition, a description of the predominant textures of each was made. analyzed mineral. As a final result, detailed images and a table with each one of the optical properties described.