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Crystal
Crystal is a solid substance in which the molecules, atoms, or ions are arranged in an orderly repeating pattern extending in all three spatial dimensions. The word Crystal is a loan from the ancient Greek word. Crystals are often symmetrically which had the same meaning, but according to the ancient understanding of Crystal. At root it means anything congealed by freezing, such as ice. The word once referred particularly to quartz, or "rock crystal"
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