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Rb dating site

Rubidium is a chemical element with the symbol Rb and atomic number 37.Rubidium is a very soft, silvery-white metal in the alkali metal group.Lepidolite contains between 0.3% and 3.5% rubidium, and is the commercial source of the element.During magma crystallization, rubidium is concentrated together with its heavier analogue caesium in the liquid phase and crystallizes last.Zone pegmatite ore bodies containing mineable quantities of caesium as pollucite or the lithium minerals lepidolite are also a source for rubidium as a by-product.

Because rubidium substitutes for potassium in the crystallization of magma, the enrichment is far less effective than that of caesium.Rubidium is not a known nutrient for any living organisms.However, rubidium ions have the same charge as potassium ions and are actively taken up and treated by animal cells in similar ways.It is the second most electropositive of the stable alkali metals and melts at a temperature of 39.3 °C (102.7 °F).Like other alkali metals, rubidium metal reacts violently with water.

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German chemists Robert Bunsen and Gustav Kirchhoff discovered rubidium in 1861 by the newly developed technique, flame spectroscopy.

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