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Definition of: plagioclase
(plā′jē·ə·klās′) noun
Feldspar consisting chiefly of the silicates of sodium, calcium, and aluminum, and crystallizing in the triclinic system. [<PLAGIO- + Gk. klasis a cleavage]
—pla′gi·o·clas′tic (-klas′tik) adjective
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