Answers are grounded in this paper and cite their sources.
(1971). Concentrations of Li, Rb, and Cs in potash feldspar and muscovite as criteria for assessing the rare-metal mineralization in granite pegmatites. International Geology Review: Vol. 13, No. 2, pp. 134-142.
No takes yet. Share an insight, caveat, or question.
V. V. Gordiyenko (1971) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: