Abstract
The paper studies the geological formations of the Geoagiu- Hărţăgani- Vălişoara- Brad region (Southern Apuseni Mountains) focusing on the content in gems minerals. Based on the field and laboratory reasearch, several perimeters of geological interest have been identified: Luncoiu Valley- Lunga Valley, Vălişoara Valley- Orăzii Valley, Baiţa-Crăciuneşti, Hărţăgani and Sanatoriu (Brad). Geologically, the minerals of gem quality (quartz, chalcedony, jasper) and they associate genetically and spatially with ophiolites, with the exception of the Brad silicolite- gems which represent geyserites generated by the neogene volcanism.
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