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How does tourmaline produce negative ions ?

  1. Sep 30, 2011 #1
    How does tourmaline produce negative ions ?

    Where those negative ions come from ?

    I know that negative ions is simply atoms with 1 extra electron so where they come from ?

    I also know that volcanic ash also produce negative ion same question ?
  2. jcsd
  3. Sep 30, 2011 #2
    This is a very wide question.
    The formula of tourmaline is this : XY3Z6(T6O18)(BO3)3V3W

    X = Ca, Na, K, vacancy

    Y = Li, Mg, Fe2+, Mn2+, Zn, Al, Cr3+, V3+, Fe3+, Ti4+, vacancy

    Z = Mg, Al, Fe3+, Cr3+, V3+

    T = Si, Al, B

    B = B, vacancy

    V = OH, O

    W = OH, F, O

    Now realize that there are lot of non metals in tourmaline.
    Due to high percussion , temperature , bond energy , in water , etc , non metals in the compound dissociate into negative ions.
    As you know non metals take or share electrons so they have excess of electrons.
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