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Magnesium Niobates

Hexagonal tablets and prisms of 4MgO.Nb2O5 (density 4.43) are obtained by adding magnesium chloride to potassium niobate solution, fusing the precipitate with anhydrous magnesium chloride, and lixiviating with water and hydrochloric acid. If the precipitated salt is fused with borax and lixiviated, MgO.Nb2O5 is obtained in small prismatic crystals. Joly's 3MgO.Nb2O5 could not be confirmed.

White, flocculent MgO.Nb2O5.7H2O precipitates from mixed solutions of magnesium chloride and sodium niobate.

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