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Sapphire Crystals
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  • sapphire
  • optical sapphire A material used in optics that differs from ruby only in the slight impurity that gives the material its color. Colorless sapphire has been used for lens manufacture because of its high refractive index and low dispersion, combined with very great...
  • crystal A solid with a structure that exhibits a basically symmetrical and geometrical arrangement. A crystal may already possess this structure, or it may acquire it through mechanical means. More than 50 chemical substances are important to the optical...
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