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Barium Gobaltite, BaO.2CoO2

When a mixture of cobalt sesquioxide, barium oxide, and barium chloride or bromide is heated to redness, or about 800° C., and the product washed with hot water and then with acetic acid, brilliant black hexagonal plates of the Barium Gobaltite, BaO.2CoO2 are formed. When this compound is treated with concentrated hydrochloric acid, chlorine is evolved. At higher temperatures, 1000°-1100° C., a monocobaltite, in large iridescent black prisms, is formed.

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