Crystals occur in a range of colors, from colorless to having multihued shades like a rainbow. The color of crystals has long fascinated and drawn humans to them. There is a crystal for every color in the rainbow and beyond, it seems. Crystals are transparent, translucent or opaque depending on various factors such as impurities or type. In general, transparent crystals are valued more highly than opaque crystals, but there are many exceptions to this as well. You might think of jade or rubies, which are opaque, but having a high value. What causes a crystal to have a certain
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