Any of a group of minerals chemically similar to feldspar but containing less silica, such as nepheline and leucite.
- The three commonest feldspathoids are leucite, nepheline, and sodalite.
- Afghanite occurs as small, typically colorless transparent crystals associated with a wide variety of feldspathoids in volcanic ejecta collected in the general Mount Vesuvius area, Italy.
- The change from incompatible to compatible behavior heralds the onset of significant plagioclase (or feldspathoid) precipitation/removal.
- Example sentences
- Salic magmas ranged widely from silicic to feldspathoidal and from peraluminous to peralkaline.
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