Abstract: This study investigated the magnesite occurrences which are hosted by Triassic aged serpantinized peridoditelocated south of the Izmir-Ankara Suture Zone. The magnesite indicates two different depositional forms withindividual veins and stokwork type magnesite in fractures and cracks which altered ultramafic rocks. Both types ofmagnesite occurences include magnesite and dolomite, while individual magnesite veins besides this have a littlecalcite. The average contents of the individual magnesite veins in the major-oxides are MgO 43,73%, SiO₂ 2,95%, 2FeO₃ 0,75%, and CaO 3,73% while the stokwork magnesite is MgO 47,04%, SiO₂ 0,39%, FeO₃ 0,55%, CaO 1,15% and a low amount of SiO2 and CaO. The content of the stokwork magnesite is determined to be the better for sintermagnesite. Some trace element contents of both types of this magnesite are correlated with the graphics of traceelement distribution in magnesite given by Möller (1989), and it is found that Cr, Ni, Co, Cu, Fe, Mn, Ba, Hg, Ti, B,Ba distrubution corresponds with magnesite related to ultramafics. Higher Sr contents in individual vein  occurences results from content of calcite. The REE (Rare Earth Element) distribution of both types of magnesiteshows positive La, Eu, Lu anomalies and negative Ce, Sm, Tb, Y anomalies. An oxidizing condition duringdeposition and a lower temperature environment are indicated.