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Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass).

The mineral sanidine, the high-temperature form of potassium feldspar, is the most desirable.With 18 protons and 22 neutrons, the atom has become Argon-40 (Ar-40), an inert gas.For every 100 K-40 atoms that decay, 11 become Ar-40.Click on the "Show Movie" button below to view this animation.K-Ar Decay Profile Clicking on the "Show Movie" button below will bring up an animation that illustrates how a K-Ar sample is processed and the calculations involved in arriving at a date.

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