Types of Crystal Structures The term crystal (Krystallos = ice) comes from the Greek and was already used in ancient times to define the rock crystal. Often it also indicates particularly well-formed individual peaks of various quartz crystals. However, the word...
How to tell if it’s a clean or manipulated crystal? Gems can be manipulated by staining, burning, radiation and other methods in order to improve their optical properties or change them. For example, a purple amethyst can be optically “transformed”...
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