Angle of extinction

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In polarized-light microscopy, the angle between an extinction direction and a crystallographic direction--e.g., crystal face, cleavage plane--of an anisotropic mineral. An extinction angle of 0 degrees is called "parallel extinction," an angle of 45 degrees "symmetrical extinction," other angles "oblique extinction;" of diagnostic value in mineral identification. Syn: extinction angle
Source: Dictionary of Mining, Mineral, and Related Terms

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