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| feld·spar [ féld spr ] or fel·spar [ fél spr ] |
noun |
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| Definition: |
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common silicate mineral: an extremely common aluminosilicate mineral containing varying proportions of calcium, sodium, potassium, and other elements. Feldspar minerals are subdivided into two groups, orthoclase feldspars and plagioclase feldspars.
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| [Late 18th century. Alteration of German Feldspath, literally "field mineral"] |
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