He led the development of the use of rubidium-strontium and uranium-lead radiometric dating methods for rocks, particularly for samples returned from the Moon.
Radiocarbon dating | radiocarbon dating | Ang Dating Daan | Radiometric dating | radiometric dating | Uranium-thorium dating | uranium-thorium dating | Thermoluminescence dating | thermoluminescence dating | Rubidium-strontium dating | Rubidium | Optical dating | Obsidian hydration dating | ''Dating in the Dark'' | Blind Dating | Badger Books SF-58 and SF-61, both dating from 1961 and bearing the byline "John E. Muller" -- but "The Mind Makers" is by Lionel Fanthorpe |
These rubidium standards are often used with GPS to produce a "primary frequency standard" that has greater accuracy and is less expensive than caesium standards.
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Two notable sources of rubidium are the rich deposits of pollucite at Bernic Lake, Manitoba, Canada, and the rubicline ((Rb,K)AlSi3O8) found as impurities in pollucite on the Italian island of Elba, with a rubidium content of 17.5%.