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Extinction (optical mineralogy)

Extinction is a term used in optical mineralogy and petrology, which describes when cross-polarized light dims, as viewed through a thin section of a mineral in a petrographic microscope. Isotropic minerals, opaque (metallic) minerals, and amorphous materials (glass) do not allow light transmission under cross-polarized light (i.e. constant extinction).…

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Extinction (optical mineralogy)

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Avg. degree1.83
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extinction minerals degrees angle mineral cleavage cross-polarized light microscope one 90 stage measure direction optical mineralogy petrology dims term used

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