Crystals and Light
| The Encyclopedia of Crystals |
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Lastly, for crystals and light, we have opaque stones, which are impervious to light. These stones will absorb all the colors of the spectrum, except for one color wavelength. This color will be reflected back, giving the stone its color. Therefore, if all wavelengths are absorbed except green, the stone will appear green. If all the light is absorbed, the stone will appear black.
Sometimes the interaction of light with a gemstone produces not a single color, but several. Gems like the diamond have the capacity to separate out the different wavelengths as light passes through them so that all the colors of the rainbow are produced. Other minerals also have this “fire” quality such as found in the fire opal.



