kristallide üks struktuurseid iseärasusi, mis seisneb kaksikkristallide moodustumises ja millistele on iseloomulik kristallide nihe kaheks sümmeetrilise orientatsiooniga piirkonnaks kahestumistasandi suhtes; põhiliikideks on mehaaniline kahestumine, faasimuutuskahestumine ja kasvukahestumine (vt kaksikkristall, mehaaniline kahestumine, faasimuutuskahestumine, kasvukahestumine)
a structural feature when a portion of a crystal takes up an orientation that is related to the orientation of the rest of the untwinned lattice in a definite, symmetrical way; the main types of twinning are mechanical twinning (deformation twinning), transformation twinning and growth twinning (see: twin, mechanical twinning, transformation twinning, growth twinning)
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