... yellow, blue, red, or colorless mineral. It is a sulfate of barium, BaSO 4, found in nature as tabular crystals or in ... this property is made use of in testing for the sulfate radical. It is practically insoluble under ordinary conditions in all ... as satisfactory as blanc fixe, a chemically precipitated barium sulfate, or lithopone, a mixture of barium sulfate, zinc sulfide, and zinc oxide. 1. Drilling ...