单词 | plagioclase |
释义 | plagioclase —plagioclastic /play'jee euh klas"tik/, adj. /play"jee euh klays'/, n. any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on good cleavage surfaces. Also called soda-lime feldspar. [1865-70; PLAGIO- + -CLASE] |
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