iris Agate, Cause of color in iris agate.

Description
Exploring the Science Behind Iris Agate: The Stone That Produces Spectacular Color When Viewed In Transmitted Light

Iris agate is agate whose thin section shows spectral colours when viewed in transmitted light. These colours are not thin-film colours such as those of precious opal.
In 1935 when Fred S. Young and Dr. H. C. Dake first showed the
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