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Reference.org
Crystal polymorphism
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<p>In crystallography, polymorphism is the phenomenon where a compound or element can crystallize into more than one <a href="/facts/Crystal_structure/bJ4bCeHd">crystal structure</a>. </p><p>The preceding definition has evolved over many years and is still under discussion today. Discussion of the defining characteristics of polymorphism involves distinguishing among types of transitions and structural changes occurring in polymorphism versus those in other phenomena. </p>