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feldspar

[feld-spahr, fel-] /ˈfɛldˌspɑr, ˈfɛl-/
noun
1.
any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks.
Also, felspar.
Origin
1750-1760
1750-60; feld- (< German: field) + spar3; replacing feldspath < German (Feld field + Spath spar)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for feldspars

feldspar

/ˈfɛldˌspɑː; ˈfɛlˌspɑː/
noun
1.
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
Derived Forms
feldspathic (fɛldˈspæθɪk; fɛlˈspæθ-), felspathic, feldspathose, felspathose, adjective
Word Origin
C18: from German feldspat(h), from feld field + spat(h) spar³
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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Word Origin and History for feldspars
feldspar
1757, from Ger. Feldspath, from Feld "field" + spath "spar, non-metallic mineral, gypsum."
Online Etymology Dictionary, © 2010 Douglas Harper
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feldspars in Science
feldspar
  (fěld'spär', fěl'-)   
Any of a group of abundant monoclinic or triclinic minerals having the general formula MAl(Al,Si)3O8, where M is either potassium (K), sodium (Na), or calcium (Ca) or less commonly barium (Ba), rubidium (Rb), strontium (Sr), or iron (Fe). Feldspars range from white, pink, or brown to grayish blue in color. They occur in igneous, sedimentary, and metamorphic rocks and make up more than 60 percent of the Earth's crust. When they decompose, feldspars form clay or the mineral kaolinite.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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