oblique extinction

A Dictionary of Earth Sciences | 1999 | 436 words | Copyright

oblique extinction (inclined extinction) 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.

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AILSA ALLABY and MICHAEL ALLABY. "oblique extinction." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

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AILSA ALLABY and MICHAEL ALLABY. "oblique extinction." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-obliqueextinction.html

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