The eclogite zone of the Tauern Window has been subject of many investigations. Published thermobarometric calculations yield coinciding 19-23kbar and about 600C. In the first part of this study three different eclogites of the Tauern Window were investigated. Two eclogites document pressures about 27kbars for the peak metamorphosis. This value fits good with the single maximum pressure of 25 kbar, published by Hoschek (2007). The calculations for the third eclogite yield a much higher pressure condition of about 33kbars, which means that this eclogite has reached the stability field of coesite. The calculated T-conditions of 570 ? 626C are well in agreement with the T-conditions published up to now. Just for one eclogite higher conditions of about 700C are preserved.The aim of the second part of this study is to investigate chemical interactions between eclogite and the adjacent host rocks micaschist, respectively talcschist. For this purpose the change of the whole rock geochemistry as well as the present minerals and their mineral chemistry along the profile was investigated. In both cases, the mineral paragenesis and the amount of these minerals changes with increasing proximity to the contact. Respectively, a change in whole rock geochemistry was observed, indicating a chemical interaction between the two adjacent rocks. In the first case, a distinct migration of Fe, Mg, Mn and Na from the eclogite into the micaschist was observed. Evidence for this is the formation of Na-bearing amphiboles in the micaschist exclusively close to the contact. The loss of substance, e.g. SiO2, is also an evidence for a metasomatic process. This is supported by the observation of a quartz layer directly at the contact of eclogite and micaschist indicating a mobilisation along the contact. The metasomatic processes are also reflected by the systematic change in mineral chemistry.