Argon is not found in minerals. It's a noble gas, meaning it's very unreactive and doesn't readily form chemical bonds with other elements.

Here's why:

* Noble gases are inert: They have a full outer shell of electrons, making them very stable and unlikely to participate in chemical reactions.

* Minerals are formed by chemical bonds: Minerals are solid, naturally occurring substances with a defined chemical composition and a crystalline structure. These structures arise from the formation of chemical bonds between different elements.

Therefore, argon exists as a free element in the atmosphere and is not found within the structure of any mineral.