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Said of certain light-colored silicon- or aluminum-rich minerals present
in the norm of igneous rocks; e.g., quartz, feldspar, felspathoid. Also,
applied to rocks having one or more of these minerals as major components
of the norm. Etymol: a mnemonic term derived from "s"ilicon + "al"uminum +
"ic." CF: femic;
mafic; felsic. AGI
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