Where Do You Find Feldspathoid?

Feldspathoids occur in a wide variety of alkali-rich SiO₂-poor igneous rocks, in metamorphic and metasomatic rocks, and in sedimentary rocks. Nepheline

and kalsilite may also be the reservoir for alkalies in the deep mantle. Melilite

Melilite

Melilite refers to a mineral of the melilite group. Minerals of the group are solid solutions of several endmembers, the most important of which are gehlenite and åkermanite. ... Minerals of the melilite group are sorosilicates. They have the same basic structure, of general formula A₂B(T₂O₇).

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Melilite - Wikipedia

, nepheline and sodalite have been reported in meteorite inclusions.

Which is a mineral of feldspathoid?

Minerals of the feldspathoid group include nepheline, leucite, sodalite, and cancrinite. Feldspathoids compositions can be displayed using a tetrahedron with quartz at the apex (Fig. 1).

Is biotite a feldspathoid?

Biotite is a common femic minerals in a wide range of rocks. In igneous rocks, it is typical of granitoids but it can be found also in pegmatites, granodiorites, tonalites, and diorites. Phlogopitic varieties may occur in feldspathoid-bearing rocks and kimberlites.