This is a 'preproof' accepted article for Mineralogical Magazine. This version may be subject to change during the production process. DOI: 10.1180/mgm.2021.27 Mcconnellite, CuCrO 2 , and ellinaite, CaCr 2 O 4 , from varicolored spurrite marble of the Daba-Siwaqa area, Hatrurim Complex, Jordan Irina O. Galuskina 1 *, Marcin Stachowicz 2 , Krzysztof Woźniak, 3 , Yevgeny Vapnik 4 , Evgeny Galuskin 1 1 Institute of Earth Sciences, Faculty of Natural Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland 2 Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, Żwirki i Wigury 93, 02-089 Warszawa, Poland 3 Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warszawa, Poland 4 Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105, Israel *irina.galuskina@us.edu.pl Abstract A common attribute of two rare natural chromium-bearing oxides: mcconnellite, CuCrO 2 , discovered more than 40 years ago in Guyana, and a new mineral ellinaite, CaCr 2 O 4 , described from two localities (Brazil, Israel) recently, is that these minerals are poorly studied due to their rarity and small size. Mcconnellite and ellinaite in the present study were found in varicolored marbles of the pyrometamorphic Hatrurim Complex in the Tulul Al Hammam area, Daba-Siwaqa, Jordan. Structural data obtained for еllinaite (Pnma, a = 9.0875(2), b =