feldspathoid

[feld-spa-thoid, fel-]

feld·spath·oid

[feld-spa-thoid, fel-] Mineralogy
adjective
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.
noun
2.
a mineral of this group, as nepheline.

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Feldspathoid is always a great word to know.
So is zedonk. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
the offspring of a zebra and a donkey.

Origin:
1895–1900; < German Feldspath (see feldspar) + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
feldspathoid (ˈfɛldspəˌθɔɪd)
 
n
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 10th Edition
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American Heritage
Science Dictionary
feldspathoid   (fěld-spāth'oid', fěl-)  Pronunciation Key 
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
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