Geological Glossary

Glossary of common terms used in geology, and related to earth sciences.

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Plagioclase

Plagioclase feldspar Plagioclase is a member of the feldspar mineral family. Plagioclase feldspars are yet another silicate that contains considerable sodium or calcium. Feldspar crystals are stubby prisms, generally white to gray and a glassy luster. This variety of plagioclase, called albite, is rich in sodium.

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