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However, the Argon, a noble gas, constitutes approximately 0.1-5% of the Earth's present day atmosphere.

Because it is present within the atmosphere, every rock and mineral will have some quantity of Argon.

Potassium can be mobilized into or out of a rock or mineral through alteration processes.

Due to the relatively heavy atomic weight of potassium, insignificant fractionation of the different potassium isotopes occurs.

The quantity of potassium in a rock or mineral is variable proportional to the amount of silica present.