Abstract: Turkish borate deposits are products of lacustrine chemical precipitation which took place during theend of Tertiary in the Western Anatolia. In view of the existing mineral assembleges, it may be stated that thosedeposits were not subjected to any high temperature and pressure. It should be noted, however, that fallowing theburrial the primary minerals were replaced by more stable once. B2O3, Na 2O and CaO are by large the most importantcomponents in the developments of Turkish borate beds. SrO, MgO and As 2O8 are of secondary importance.