Barium Chromite, BaCr₂O₄

Barium Chromite, BaCr₂O₄, is obtained as a dense green crystalline powder by heating a mixture of potassium dichromate and barium chloride to redness. By heating together chromium sesquioxide and barium oxide in the electric furnace a polychromite, BaO.4Cr₂O₃, is produced, even when excess of baryta is present. It forms a greenish-brown powder of density 5.4 at 15° C.