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Characteristics of chromium ore occurrences near the village of Trnava, Raška municipality, Serbia 2018 http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai/record/1/6983 http://bgd.bg/REVIEW_BGS/REVIEW_BGD_2018_3/PDF/53_Vakanjac_GeoSci_2018.pdf B. Vakanjac P. Mijatović R. Krunić S. Dušanić Z. Bojić Ophiolites are represented as parts of the oceanic crust, originating in the mid-oceanic ridge or supra-subduction zone regime and tectonically placed at the continental margin. The placement of ophiolites occurred during closure of the ocean (Tethys in this case) or due to exhumation, when deep material was transported to the surface (Petrović, 2015). In the mafic-serpentinite assemblage at Trnava village, there are harzburgite, dunite, rare lherzolite and pyroxenite (enstate and diallagite). Serpentinite is the most widespread. Numerous occurrences of chromite ore have been identified in the ultramafic-serpentinite complexes of this area (Urošević at al., 1973). These have been explored and locally exploited. The main occurrences are in the area of Trnava–Milatkovici. conferenceObject 129 130 REVIEW OF THE BULGARIAN GEOLOGICAL SOCIETY, vol. 79, part 3, 2018,