单词	feldspathoid
释义	feldspathoid /ˈfɛl(d)spəˌθɔɪd / noun Geology 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. Derivatives feldspathoidal /fɛl(d)spəˌˈθɔɪd(ə)l/ adjective ... Salic magmas ranged widely from silicic to feldspathoidal and from peraluminous to peralkaline.
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