+A crystal is a solid material where atoms, molecules, or ions are arranged in a highly ordered repeating pattern, extending in all three spatial dimensions. This inherent [Order](/wiki/order) gives rise to characteristic geometric shapes with flat faces and sharp angles, reflecting its internal [Structure](/wiki/structure). They form naturally through processes like solidification from a liquid or deposition from a solution.
+## See also
+- [Mineral](/wiki/mineral)
+- [Gemstone](/wiki/gemstone)
+- [Solid](/wiki/solid)
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