1 Draft Manuscript (In Preparation) Preliminary SEM/EDS results of Potential New Minerals from the Varicolored Marble of Central Jordan Hani N. Khoury Department of Geology The University of Jordan, Amman Jordan 11940 khouryhn@ju.edu.jo Abstract: Preliminary SEM/EDS results of samples collected from the varicolored marbles of Tulul Al Hammam site have indicated potential new minerals. Unusual mineralization also occurs in the associated travertine and regolith. The new potential identified phases are (FeCa) and (CaSi) alloys, KZn(Cu,Fe) sulfide, KCuCa sulfate, oxides of FeCa(CrNi), CaFeAl(TiZn), CrMg(ZnAlFe) and Ca(LaCeNd)Th. Among these phases are F - -rich Ca-uranate, Ce(U)Ca vanadates, and CaCd and MgAl(CaFe) silicates. All these phases are indicative of formation under reducing/oxidizing conditions as a result of combustion metamorphism. The oxygen supply during combustion was the controlling factor for the formation of the oxides, sulfides and/or sulfates of the RSE and REE. During the combustion events high temperature sulfides were mainly governed by local redox conditions. Conversion of sulfide sulfur to sulfate occurred by oxidative combustion of dispersed sulfur (S 2– )-rich protolith to (S 6+ ), followed by the liberation of metals bound to the original sulfides and organic matter. Central Jordan pyrometamorphic sites give real-world insights into the outcome of natural analogues modeling results to verify its accuracy. Key Words: Varicolored Marble, New Minerals, Mottled Zone, Central Jordan, Tulul Al Hammam, Pyrometamorphism, Natural Analogues, Natural Cement