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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
There are 12 types classified in nature along with similar minerals called feldspathoids such as nepheline syenite.
Another choice in feldspars: Jeff Zamek provides the results of comparative tests of potash feldspars
By other hand, the feldspathoids presented in the pellets do not have capacity to adsorb EGME.
Air lime mortars with incorporation of sepiolite and synthetic zeolite pellets
Alkali-rich rocks and feldspathoidal rocks are tare (feldspathoids and quartz are mutually exclusive) and plagioclase typically dominates over alkalifeldspar.
Igneous rock associations 8. Arc magmatism II: geochemical and isotopic characteristics
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.
Zeolite occurrences in the Central Metasedimentary Belt of the Grenville Province, Ontario, Quebec and New York State
Rock-forming minerals; v.4B: Framework silicates; silica minerals, feldspathoids and the zeolites, 2d ed.
Rock-Forming Minerals: v.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. The mineral particles, about 1,000 times smaller than a grain of sand, do not dissolve easily and therefore keep the contaminants trapped in the soil.
Soil can trap radioactive toxins