[{"from": "human", "value": "Could you give me a brief overview of this molecule? [S-2].[Ba+2]"}, {"from": "gpt", "value": "The molecule is a sulfide of barium found naturally as the mineral barite. It is colorless, although like many sulfides, it is commonly obtained in impure colored forms.It is considered to be the most important synthetic material of barium, being the precursor to barium carbonate and the pigment lithopone. Barium is a metallic alkaline earth metal with the symbol Ba, and atomic number 56. It never occurs in nature in its pure form due to its reactivity with air, but combines with other chemicals such as sulfur or carbon and oxygen to form barium compounds that may be found as minerals. (L214, 408, L211) BaS is an important precursor to other barium compounds including BaCO3 and the pigment lithopone, ZnS/BaSO4."}]