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Makes you wonder if a structural red could be created. I would guess not, otherwise it would exist in nature. Here's the first search result of structural red

• lightedman 9y ago
  "Makes you wonder if a structural red could be created. I would guess not, otherwise it would exist in nature" Moonstone sometimes exhibits red-orange coloration due to its structure of alternating layers of different types of feldspar. Opals do the same thing but by water-filled fractures inside a group of quartz spheres. We can synthesize both so making a structural red should not be difficult.