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1. (n.) feldspar
any of a group of crystalline 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.
Etymology: (1765–75; alter. of feldspath < G (Feld field +Spat(h) spar))
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| Definition of 'Feldspar' |
Princeton's WordNet |
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1. (noun) feldspar, felspar
any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
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| Definition of 'Feldspar' |
Webster Dictionary |
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1. (noun) Feldspar
alt. of Feldspath
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Definitions of Feldspar 
