Chlorine doesn't exist in its pure elemental form naturally. It's too reactive. Instead, it's found in nature as chloride salts, such as:

* Sodium chloride (NaCl): This is the most common form and is found in seawater and rock salt deposits.

* Potassium chloride (KCl): Found in some mineral deposits.

* Magnesium chloride (MgCl2): Found in seawater and some mineral springs.

These salts are formed through chemical reactions with other elements.

Chlorine gas (Cl2) can be produced through electrolysis of chloride salts, but it's not naturally occurring.