Abstract: Fluorit es were collected from a F-Pb vein related with hypabissal granodiorite porphyr intrusions ofSantonian-Campanian agewithin Istranca massif. In this vein type mineralization the fluorite and galena are the dominant ore minerals. Par agenesis consistsof fluorite + quartz + galena + pyrite + calcite. The host rock is represented by poly met amorphic crystalline basement of Precambrian age.M icrothermometric measurements on nearly 100 two-phase (1+v) inclusions yield mean homogenization temperature of 275 °Cforfluorites. Salinities range from 5 to 10 wt. percent NaCI equivalent, with mean of 7,5 %. M icrothermometric measurements onquartz reveal mean homogenization temperature oj`235"C. No fluid inclusions have been observed in calcites.The rare earth element contents of the fluorite is quite variable, ranging from 0,03 to 0,9 ppm and Ce/Yb ratios reflect the dominant trend of light rare earth element (LRIIF) enrichment. The similarity in the Tb/La ratios of dark purple, light purple and whitefluorite. indicates crystallization at about the same time. Chondrile normalized plot and rare earth element ratios of fluorite revealpersistent pozitive Ce anomalies, indicating low oxygen fugacities at the source area and negative Eu anomalies indicate the presence of the same conditions at the deposition site. Tb/La and Tb/Ca ratios confirm a liydrothermal origin for fluorites.