Steven Dutch, Professor Emeritus, Natural and Applied Sciences, Universityof Wisconsin - Green Bay

Plane-Polarized Light

Crossed Polarizers

Quartz, the feldspars, cordierite and nepheline all have low relief and gray to white interference colors. Beginners find them hard to tell apart. View Quartz and its Look-Alikes. The photos below show thetypical appearance of plagioclase in thin section.

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Created 22 Sept 1997, Last Update 31 May 2020