Unit-cell meaning

The smallest building block of a crystal, consisting of atoms, ions, or molecules, whose geometric arrangement defines a crystal's characteristic symmetry and whose repetition in space produces a crystal lattice.
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The smallest unit of structure of a crystal: it has sides parallel to the crystal axes and its exact repetition in three dimensions along these axes generates the space lattice of a given crystal.
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(mineralogy) In a crystal, the smallest repeating structure (parallelepiped) of atoms from which the structure of the complete crystal can be inferred.
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