Definition of Plageoclase
Pla"gi*o*clase (?), n. [Gr. &?; oblique
+ &?; to break.] (Min.) A general term used of any
triclinic feldspar. See the Note under Feldspar.
- Webster's Unabridged Dictionary (1913)
- 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.
- The Nuttall Encyclopedia
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