Barium Carbonate
chemical formula: BaCO3
( powder )
Barium Carbonate is used in the manufacturing of various Barium compounds including Barium Nitrate, Barium Oxide, Barium Hydrate, Barium Chromate, Barium Peroxide and Barium Titanate. It's an important ingredient of optical glass, and is used to color flames green in pyrotechnic formulations.