... as witherite, is a chemical compound used in rat poison, bricks, ceramic glazes and cement.Witherite crystallizes ... Northumberland. It is used for the preparation of rat poison, in the manufacture of glass and porcelain, ... S24/25NFPA 704020Flash pointNon-flammableLD50418 mg/kg, oral (rat)Related compoundsOther cationsMagnesium carbonateCalcium carbonateStrontium carbonate Sinoright International Trade ...