Plagioclase
WordNet

noun


(1)   Any of a series of triclinic feldspars that form rocks
WiktionaryText

Noun


plagioclase
  1. A group of feldspar minerals that form a solid solution series from albite (sodium aluminum silicate) to anorthite (calcium aluminum silicate). The plagioclase feldspars are found in igneous, plutonic, and metamorphic rocks. They all have the triclinic-pinacoidal crystal habit, but only Albite commonly occurs in well crystallized specimens.

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