Rodingites appear throughout the Othris area within ophiolitic rocks and mélange formation. They have formed by interaction of H2O-rich fluids with gabbroic rocks and dolerites during serpentinization of the surrounding rocks. These metasomatic fluids caused depletion of Si, Na, K and enrichment in Ca. Observed mobility of Zr, Y and Cr is possibly due to infiltration processes. Rodingites present lower ΣREE than their protoliths but subparallel REE patterns. Mineral assemblages of most rodingites are consistent with formation from low-T fluids, whereas the presence of vesuvianite in few samples implies that fluid temperatures reached higher levels or there was significant CO2 loss.