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Idiochromatic Gems
[Peridot (Fe+2), rhodocrosite (Mn), cuprite (Cu+1), malachite (Cu+2)] ...
The colors in these idiochromatic gems come from elements that are an essential part of their chemical composition. These gems generally have only one color, or show a very narrow range of colors.
 See also: Prong, Aquamarine, Beryl, Amethyst, Carbon
  
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