Rublev Colours Barite is made using the highest quality white, natural barium sulfate ore. Its fine grind (3-micron median particle size), high specific gravity (4.3–5), and inertness make it ideal for grounds, to make white paint in watercolor, casein, and egg tempera, and as an extender pigment in oils and alkyds. Pigment Names Mineral Names English: barite, …