large-ion lithophile (LIL) Element of large ionic radius and with a valency of 1 or 2 (e.g. Rb2+, Pb2+, and Ba2+), which during igneous fractionation tends to be concentrated in silicic melts, and from which LILs are incorporated mainly into potassium silicates such as the alkali feldspars and micas. See also FRACTIONAL CRYSTALLIZATION; and INCOMPATIBLE ELEMENTS.
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