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A '''crystal''' or crystalline solid is a solid [[material]], whose constituent [[atoms]], [[molecule]]s, or ions are arranged in an orderly repeating [[pattern]] extending in all three spatial [[dimension]]s. The [[scientific]] [[study]] of crystals and crystal formation is [http://en.wikipedia.org/wiki/Crystallography crystallography]. The [[process]] of crystal formation via [[mechanism]]s of crystal [[growth]] is called crystallization or solidification. The word crystal is derived from the ancient Greek word κρύσταλλος (krustallos), which had the same [[meaning]], but according to the ancient understanding of crystal. At [[root]] it means anything congealed by freezing, such as ice.[1] The word once referred particularly to quartz, or "rock crystal".

A '''crystal''' or crystalline solid is a solid [[material]], whose constituent [[atoms]], [[molecule]]s, or ions are arranged in an orderly repeating [[pattern]] extending in all three spatial [[dimension]]s. The [[scientific]] [[study]] of crystals and crystal formation is [http://en.wikipedia.org/wiki/Crystallography crystallography]. The [[process]] of crystal formation via [[mechanism]]s of crystal [[growth]] is called crystallization or solidification. The word crystal is derived from the ancient Greek word κρύσταλλος (krustallos), which had the same [[meaning]], but according to the ancient understanding of crystal. At root it means anything congealed by freezing, such as ice.[1] The word once referred particularly to quartz, or "rock crystal".

Most metals encountered in everyday life are [http://en.wikipedia.org/wiki/Polycrystal polycrystals]. Crystals are often [[symmetrically]] intergrown to form crystal twins.

Most metals encountered in everyday life are [http://en.wikipedia.org/wiki/Polycrystal polycrystals]. Crystals are often [[symmetrically]] intergrown to form crystal twins.