[IMAGE 6]

With the "naked eye," that is, without a microscope, we see the Uniaxial Interference Pattern in a rock crystal in its rainbow colors.  Notice the offset of the pattern at the crack.  With permission.  Wood, Elizabeth A. Crystals And Light: An Introduction to Optical Crystallography, Revised Edition, Dover Publications, Inc., New York, 1977, Plate V(3).   The current address of Dover Publications, Inc., is Mineola, New York.

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