Determinations are given of all of the alkalies (lithium, sodium, potassium, rubidium, and cesium) in 43 samples of micas, including paragonite, muscovite, biotite, phlogopite, vermiculite, zinnwaldite, taeniolite, lepidolite, and polylithionite.

The geologic occurrence of the rare alkalies in micas is discussed. Increase in rare alkalies in micas from successive stages of hydrothermal replacement in pegmatites is shown. Lithium was found to be present in all the micas analyzed, but rubidium and cesium were found only in micas from the later stages of magmatic differentiation.

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