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Crystals, or crystalline solids, are often used in crystal healing therapy, and, along with gemstones, are sometimes associated with spellwork in [[Wicca]]n beliefs and related [[occult]] practices. The Sumerians utilized crystals in their [[ritual magic|magical]] formulas as long as 6000 years ago. | Crystals, or crystalline solids, are often used in crystal healing therapy, and, along with gemstones, are sometimes associated with spellwork in [[Wicca]]n beliefs and related [[occult]] practices. The Sumerians utilized crystals in their [[ritual magic|magical]] formulas as long as 6000 years ago. | ||
Examples of large crystals include snowflakes, [[ | Examples of large crystals include snowflakes, [[diamond]]s, and table salt. Most inorganic solids are not crystals but polycrystals, i.e. many microscopic crystals fused together into a single solid. Polycrystals include most metals, rocks, ceramics, and ice. A third category of solids is amorphous solids, where the atoms have no periodic structure whatsoever. Examples of amorphous solids include glass, wax, and many plastics. | ||
==Etymology== | ==Etymology== | ||