Behavior of rare earth elements in geosphere is a good indicator of the geochemical conditions and processes. Hydrothermal synthesis experiments of rare earth fluorocarbonate minerals are carried out on starting materials with bastnaesite-calcite composition. Bastnaesite and calcite are main run products between 300C and 600C. At 300C and 350C, water vapor pressure, parisite may be slightly crystallized after 200 days run duration.
