sentence: Barium carbonate occurs as 'witherite'.
sentences_after: Witherite is the main source of barium salts. It is more easily turned into other barium compounds than barium sulfate, barite. It is heavily mined in Northumberland. It turns into barium sulfate when water containing sulfates flows through it.
concept_name: barium carbonate
headings: Barium carbonate Occurrence
categories: Barium compounds Carbonates