Barium oxide (BaO), a white powdery chemical compound used in various industrial and scientific applications.
From Greek 'barys' (heavy), modified to 'bary-' meaning barium compounds. The name reflects the heaviness of barium. Renamed from older alchemical terms in the 18th century.
Baryta was one of the first 'rare earth' materials that confused early chemists because barium compounds are surprisingly heavy—they thought they'd discovered something exotic when it was 'just' a metal oxide!
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