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Four twins are interpreted by pseudo-symmetry analysis. The pincer complexes Co(PCP) X  ( X =Cl, Br) are order-disorder (OD) twins. The individuals are composed of one polytype with a maximum degree of order (MDO) with  Pc  symmetry, whereas at the composition plane is located a fragment of the second MDO polytype with  Pbc 2 1  symmetry. The twinning of the low-temperature (LT, 100 K)  P 2 1  phase of 2,3-dicyanohydroquinone dihydrate (DCHQ·H 2 O) can be explained by a symmetry reduction of index 2 from the high-temperature (HT, 250 K)  Pn 2 1  m  phase. Propylammonium perchlorate ( n PrNH 3 ClO 4 ) features different kinds of twinning. On the one hand, transformation twinning is caused by a symmetry reduction of index 2 from the HT (150 K)  Pbnm  to the LT (100 K)  P 2 1 / n  phase. On the other hand, the crystals feature growth twinning by rotation about the [010] axis, where the nature of the twin interface remains unknown. The twinning of the  Ccce  Ba[H 2 TeO 5 ] structure with pseudo-tetragonal metrics is explained by a part of the structure featuring higher  P 4 2 / nmc  symmetry. At the twin interface is probably located a fragment with the formal composition TeO 3 .

Pseudo-symmetry analysis to unravel the secrets of twins – a case study with four diverse examples