An orientation relationship between adjacent crystalline regions related by a specific crystallographic symmetry operation. A multiply twinned particle is not one perfect lattice with the composite particle symmetry.
A finite particle composed of several crystallographically twinned domains. A composite fivefold outline does not require one periodic lattice to have fivefold rotational symmetry. In a decahedral fcc model, five tetrahedral domains meet around a common near- axis; elastic distortion accommodates the angular deficit.
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Crystal twinning refers to a phenomenon where two or more individual crystals, known as "crystal individuals," share some of the same crystal lattice points in a symmetrical manner, resulting in a single, unified crystal structure. This occurs during the growth of crystals when conditions allow for the incorporation of multiple crystals into one entity. Twin crystals can exhibit different shapes, orientations, and properties, depending on how they are formed and the specific conditions under which the twinning occurs.