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.
Mârza, Ioan and Constantina, Ciprian
Minerale geme asociate genetic ofiolitelor mezozoice si gheizeritelor neogene, din Muntii Apuseni de Sud,
Studia UBB Geologia
Available at: https://digitalcommons.usf.edu/geologia/vol45/iss1/art8