feldspathoid

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feld·spath·oid

 (fĕld-spăth′oid′, fĕl-)
n.
Any of a group of relatively rare minerals that are chemically very similar to feldspars, but have too little silica to qualify as feldspars.

[feldspath (obsolete variant of feldspar, from obsolete German Feldspath, feldspar; see feldspar) + -oid.]

feldspathoid

(ˈfɛldspəˌθɔɪd) or

felspathoid

n
(Geological Science) any of a group of rock-forming minerals, such as leucite and sodalite, that are similar to feldspars but contain less silica

feld•spath•oid

(ˈfɛld spæˌθɔɪd, ˈfɛl-)

adj.
1. Also, feld`spath•oi′dal. of or pertaining to a group of minerals similar in chemical composition to certain feldspars except for a lower silica content.
n.
2. a mineral of this group, as nepheline or leucite.
[1895–1900; < German Feldspat(h) (see feldspar) + -oid]
References in periodicals archive ?
Whereas phosphatic rocks are feedstock for both conventional and unconventional phosphate fertilizers, potassium silicates, such as feldspars, biotite, phlogopite, and muscovite, and rocks with feldspathoids, such as leucite, nepheline and clayrich sediments, especially illite, are the basis for alternative potassium fertilization (Straaten, 2010).
There are 12 types classified in nature along with similar minerals called feldspathoids such as nepheline syenite.
By other hand, the feldspathoids presented in the pellets do not have capacity to adsorb EGME.
Likewise, altered feldspathoids in the nepheline syenites in the Bancroft, Ontario area (formerly called "hydronephelite" or "giesekite") are mixtures of natrolite and muscovite, [+ or -] analcime and other minor constituents.
4B: Framework silicates; silica minerals, feldspathoids and the zeolites, 2d ed.
To the researchers' surprise, over time the contaminants in the experimental set-ups were bound by newly formed clays, forming unusual minerals called zeolites and feldspathoids.
Back-scattered electron and secondary electron images of altered feldspathoids confirmed zones with different ratios of intimately intergrown thomsonite and gonnardite resembling primary feldspathoid zoning and shaping.