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However, because Rb substitutes for K in minerals and these minerals have different K/Ca ratios, the minerals will have had different Rb/Sr ratios.
During fractional crystallization, Sr tends to be come concentrated in plagioclase, leaving Rb in the liquid phase.
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The Rb-Sr dating method has been used extensively in dating rocks.
If the initial amount of Sr is known or can be extrapolated, the age can be determined by measurement of the Rb and Sr concentrations and the Sr ratio.
Rubidium was once thought to be quite rare but recent discoveries of large deposits indicate that there is plenty to use.
However at present it finds only limited application in the manufacture of cathode ray tubes.