from The Century Dictionary and Cyclopedia
- In petrography, in the quantitative classification of igneous rocks (see rock), extremely alkalic: said of salic minerals, or of magmas in which they preponderate, when the ratio of the salic K2O and Na2O to salic CaO is greater than 7:1. It is applied to femic minerals, or to magmas in which they preponderate, when the ratio of the femic K2O and Na2O to femic CaO, MgO, and FeO is greater than 7:1.
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