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

Therefore, mafic rocks and minerals often contain less potassium than an equal amount of silicic rock or mineral.

This isotope of argon is quite unstable, having a half-life of only 269 years.

Consequently, the amount of it found in rocks is negligible — unless you subject them to an artificial neutron source.

A crucial point to note is that because K are isotopes of the same element, they have the same chemical properties.

However, in many instances, the published “ages” have no merit, as they fail the simple statistical tests that should be applied to all such data. In these experiments, a sample is heated in steps of increasing laboratory extraction temperature, until all the argon is released.

The argon released in each step is measured to calculate a “step age” with an associated analytical error.