Zeolites

Zeolites

If aluminium atoms replace some of the silicon atoms within the three-dimensional $SiO_2$ network, the resulting framework is called an aluminosilicate. Because aluminium contributes one fewer positive charge than silicon, this substitution leaves the framework with an overall negative charge, which is balanced by cations such as $Na^+$, $K^+$ or $Ca^{2+}$. Feldspar and zeolites are both examples of aluminosilicate minerals. …