 The hashemite crystals are not composed of pure barium chromate but instead contain some small sulfur content as well.The different crystals contain a range of sulfur impurities ranging from the more pure dark crystals, Ba1.00(Cr0.93, S0.07)1.00O4, to the less pure light crystals, Ba1.00(Cr0.64, S0.36)1.00O4.Hashemite was found to be an isostructural chromate analog of baryte, BaSO4.