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feldspathoid

[feld-spa-thoid, fel-] /ˈfɛld spæˌθɔɪd, ˈfɛl-/
adjective
1.
Also, feldspathoidal. of or pertaining to a group of minerals similar in chemical composition to certain feldspars except for a lower silica content.
noun
2.
a mineral of this group, as nepheline.
Origin
1895-1900
1895-1900; < German Feldspath (see feldspar) + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for feldspathoidal

feldspathoid

/ˈfɛldspəˌθɔɪd/
noun
1.
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 & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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feldspathoidal in Science
feldspathoid
  (fěld-spāth'oid', fěl-)   
Any of a group of relatively rare minerals that are chemically very similar to feldspars, but have too little silica to qualify as feldspars. Feldspathoids occur in igneous rocks with little or no silica.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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