Barite
Barite (barium sulphate BaSO4) is the only commercial source of barium and barium compounds. It is a relatively soft, inert mineral with a high SG (specific gravity) in the range of 4.2–4.5. ... Australasian Institute of Mining and Metallurgy. Monograph Series 8:27–30. McCallum WS, 1990. Oraparinna barite deposits.
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