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Potassium, an alkali metal, the Earth's eighth most abundant element is common in many rocks and rock-forming minerals.The quantity of potassium in a rock or mineral is variable proportional to the amount of silica present.If the mineral contained 1 part per million Parentium-123 and 3 parts per million Daughterium-123, we could be sure all the Daughterium-123 was originally Parentium-123.In other words there was originally 4 parts per million Parentium-123 and 0 parts per million Daughterium-123.Due to the relatively heavy atomic weight of potassium, insignificant fractionation of the different potassium isotopes occurs.However, the Argon, a noble gas, constitutes approximately 0.1-5% of the Earth's present day atmosphere.An hourglass is a helpful analogy to explain how geologists calculate the ages of rocks.When we look at sand in an hourglass, we can estimate how much time has passed based on the amount of sand that has fallen to the bottom.
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We could be sure that a mineral containing parentium originally had no daughterium.
Therefore, mafic rocks and minerals often contain less potassium than an equal amount of silicic rock or mineral.
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