Abstract
Leucite appears as a mineral in K-rich lavas, if the SiO2 content of the rock varies between 44 and 56 wt% (Washington 1906). When the SiO2 content is close to 56 wt%, it may appear but then the SiO2/K2O ratio should be below 10; in that case the K2O content of the rock is close to 6 wt%. In silica-deficient rocks (SiO2 < 45 wt%), leucite may appear even though the K2O content is slightly higher than 1 wt%. The K2O/Na2O ratio is always greater than one in leucite-bearing rocks, but the prohibitive tendency of high soda may be eliminated if the SiO2/K2O ratio is low.
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Gupta, A.K. (2015). Chemical and Physical Constraints for Crystallization of Feldspathoids and Melilite in Potassium-Rich Rocks. In: Origin of Potassium-rich Silica-deficient Igneous Rocks. Springer Geology. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2083-1_6
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DOI: https://doi.org/10.1007/978-81-322-2083-1_6
Publisher Name: Springer, New Delhi
Print ISBN: 978-81-322-2082-4
Online ISBN: 978-81-322-2083-1
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