a refractory brick made from a size graded batch comprising 20 - 30 weight percent magnesite containing less than 0 . 8 weight percent silica , and the balance a chrome ore . the chrome ore includes oxides of chromium , aluminum and iron wherein the ratio between the oxides of chromium and the oxides of aluminum and iron is greater than 2 to 1 . the silica content of the chrome ore is less than 2 . 7 weight percent , the iron oxide content is less than 17 weight percent , and the chrome ore to magnesite ratio is between 2 . 33 to 4 to 1 .