Plagioclase
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Pronunciation
- plaj' ee o klaze
Etymology
- plageo, Greek "oblique" + klao, Greek "I cleave"
Noun
- 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.
Plagioclase feldspar series
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