たんさん 炭酸
1. barium carbonateChemistry
Wikipedia definition
2. Barium carbonateBarium carbonate, also known as witherite, is a chemical compound used in rat poison, bricks, ceramic glazes and cement. Witherite crystallizes in the orthorhombic system. The crystals are invariably twinned together in groups of three, giving rise to pseudo-hexagonal forms somewhat resembling bipyramidal crystals of quartz, the faces are usually rough and striated horizontally. The mineral is named after William Withering, who in 1784 recognized it to be chemically distinct from barytes.
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