Often, feldspathoids and rare calc-silicates such as scapolite are found in more marginal areas.
2.
Rocks with feldspathoids are silica-undersaturated, because feldspathoids cannot coexist in a stable association with quartz.
3.
Rocks with feldspathoids are silica-undersaturated, because feldspathoids cannot coexist in a stable association with quartz.
4.
Analcime is usually classified as a zeolite mineral, but structurally and chemically it is more similar to the feldspathoids.
5.
Silicate minerals associated with such compositions are pyroxene, olivine, and silica-undersaturated minerals such as nepheline and other feldspathoids.
6.
Alkalies were already linked with feldspars and feldspathoids both in alkali syenites and in metasomatic fenites to be contained by residual carbonate.
7.
Feldspathoids are structurally similar to feldspar, but differ in that they form in Si-deficient conditions which allows for further substitution by Al 3 +.
8.
Rarer intermediate composition and mafic pegmatites containing amphibole, Ca-plagioclase feldspar, pyroxene, feldspathoids and other unusual minerals are known, found in recrystallised zones and apophyses associated with large layered intrusions.
9.
Mineral assemblages in phonolite occurrences are usually abundant feldspathoids ( nepheline, sodalite, hauyne, leucite and analcite ) and alkali feldspar ( sanidine, anorthoclase or orthoclase ), and rare sodic plagioclase.
10.
Feldspars, quartz or feldspathoids, olivines, pyroxenes, amphiboles, and micas are all important minerals in the formation of almost all igneous rocks, and they are basic to the classification of these rocks.
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