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areas within an opal that produce a play-of-color are made up of millions of microscopic silica spheres arranged in an orderly network. these spheres are only about / micron in size, and they act as a diffraction grating. as the light passes through, it is diffracted into the colors of the spectrum.
mining areas in australia include: coober pedy, mintabie, andamooka, lightning ridge, yowah, koroit, jundah, quilpie and others. opal production in mexico also began in the late s. mexico is best known for its fire opal in bright yellow, orange and red colors. a series of opal discoveries in the s made...
https://geology.com/gemstones/opal/