oblique extinction

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In optical mineralogy, the extinction of a mineral (i.e. it becomes dark) in crossed polars with its cleavage traces or crystal boundaries positioned at an oblique angle to the E–W and N–S planes of vibration of the polarizer and analyser. Several different angles of extinction may be determined for the same mineral, and the maximum angle may be used for identification purposes.

Subjects: Earth Sciences and Geography.

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