How does tourmaline produce negative ions ?

1. Sep 30, 2011

lnsanity

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. Sep 30, 2011

Sankalp Zeal

This is a very wide question.
The formula of tourmaline is this : XY3Z6(T6O18)(BO3)3V3W

where:
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.