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penetration twin
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penetration twin

crystallography
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In crystallography, a penetration twin is a type of crystal intergrowth where two or more crystals appear to pass through each other. These crystals are joined along a complex surface, and their atomic structures have different orientations but share common planes or directions.12

Penetration twins often share the center of their axial systems, giving them a unique, sometimes starlike or crosslike appearance. This type of twinning can occur from the very beginning of crystal growth.2

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  1. penetration twin
  2. twinning

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