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The Rubidum-strontium dating method, is one of the ways that geologists determine the age of rocks.

The utility of the rubidium-strontium isotope system results from the fact that different minerals in a given geologic setting can have distinctly different Sr.

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.

For example, the only thing an atom of uranium-235 and an…

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Like other group 1 elements this metal reacts violently in water.

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.

In common with Potassium and Cesium this reaction is usually vigorous enough to ignite the liberated hydrogen.

Rubidium has also been reported to ignite spontaneously in air.

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