Features in Thin Section - Crossed Polarizers

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
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The Cardinal Rule of Thin Sections

What you see in thin section is a random cross-section through a grain whose properties vary in three dimensions. Therefore, always view as many grains of a mineral as possible to get an idea of the total range of properties you observe. Also, bear in mind that you may not get a grain that displays some property to optimum effect.

Extinction

Interference Colors

Isotropic Materials

Anomalous Interference Colors

Zoning

Undulose Extinction

Twinning

Exsolution

 


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Created December 30, 1999, Last Update 14 December 2009

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