felspar

[fel-spahr]
noun

Origin:
< German Fels rock + spar3, by false etymological analysis

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World English Dictionary
feldspar or felspar (ˈfɛldˌspɑː, ˈfɛlˌspɑː)
 
n
any of a group of hard rock-forming minerals consisting of aluminium silicates of potassium, sodium, calcium, or barium: the principal constituents of igneous rocks. The group includes orthoclase, microcline, and the plagioclase minerals
 
[C18: from German feldspat(h), from feld field + spat(h) spar³]
 
felspar or felspar
 
n
 
[C18: from German feldspat(h), from feld field + spat(h) spar³]
 
feldspathic or felspar
 
adj
 
fel'spathic or felspar
 
adj
 
'feldspathose or felspar
 
adj
 
'felspathose or felspar
 
adj

felspar (ˈfɛlˌspɑː)
 
n
a variant (esp Brit) of feldspar
 
felspathic
 
adj
 
'felspathose
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
One of the more common sources of sodium in water is from the dissolution of clay and felspar minerals.
Look now: you can see big crystals of felspar, and maybe the sparkle of mica.
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