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Magnesium Tetraborate
Boric acid can be used to form many polymeric ions. The tetraborate ion, B4O72 -, is very common; the hydrogen tetraborate ion, HB4O7 -, as well as triborate and pentaborate, are also seen. The various metaborate ions have an empirical formula of BO2 -, and form metaborate compounds. Formation of these complicated, potentially infinite network structures is extensive, perhaps surpassed only by the silicates.
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