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25% of these orange to grapefruit size agate geodes contain chalcedony banding at the right spacing to permit the refraction of a concentrated light source or sunlight through the 1/8" to 1/16" cut and polished slab to form the very rare and beautiful rainbow or Iris Agate. The thrilling colors of the rainbow agate originate in closely banded geodes, sometimes with a quartz center (crystalline centers) and these agates have a bluish, grey white, sometimes amber, brown, pink, green or red banding and takes a very high polish. It will provide many nicely cut and banded cabochons or slabs. This agate will take a color dye in the usual manner.