Plagioclase Feldspar Definition

plājē-ə-klās, -klāz, plăjē-
noun
Any of a series of triclinic feldspars that are a common constituent of rocks, consisting primarily of a mixture of sodium aluminum silicate, NaAlSi3 O8 , and calcium aluminum silicate, CaAl2 Si2 O8 .
American Heritage

Origin of Plagioclase Feldspar

  • Greek plagio- plagio- Greek klasis breaking (from its oblique cleavage) (from klān to break)

    From American Heritage Dictionary of the English Language, 5th Edition

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PPLPLA

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RARPAR

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