AND

containing sodic pyroxenes, in the transition zone be-tween the Pelagonian Crystalline Massif and the Vardar Ophiolite Belt, in Macedonia, Yugoslavia, has been re-investigated, and pyroxenes, micas, plagioclase, and clinozoisite analysed by microprobe. The presence of the high-pressure metamorphic assemblage quartz + ompha-cite+albite is confirmed, giving the first definite indica-tion of blueschist-facies metamorphic conditions in Yugoslavia. THE first, and as yet the only recorded occurrence of 'jadeitite ' in Yugoslavia was recorded by Tu6an (1936a). The jadeitite, a pyroxene schist, is found as loose blocks in the Aljagica district, between the mountains Solunska glava and Karad~ica, about 25 km south of Skopje, Macedonia. This district ties in the Dinaride fold belt, on the northeastern border of the Pelagonian Crystalline Massif, ad-jacent o the western part of the Vardar Ophiolite Belt (fig. 1). The pyroxene schist is a dense, tough, very fine-grained rock, greenish grey in colour, with a massive but inhomogeneous structure, showing granoblastic texture in thin section. Tu6an listed the minerals in the rock as jadeite, clinozoisite, epidote, white mica, biotite, quartz, acid plagio-clase, amphibole, graphite, sphene, and zircon. Our investigations confirm this list, except that two pyroxenes are present, omphacite and sodic augite, the acid plagioclase is albite and the white mica is phengitic muscovite (Tables I and II). Tu6an (1936a) gave the analysis of the rock as SiO2 52.32