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A recently reported six-fold twin in β-Ca 11 B 2 Si 4 O 22  was interpreted as a transformation twin obtained during cooling of a hypothetical hexagonal high temperature phase. The suggested dichromatic symmetry of the twin is incorrect because (1) a six-fold twin cannot be represented by a dichromatic twin point group but by a hexachromatic group; (2) the reported dichromatic group does not exist. The correct hexachromatic twin point group is reported here.

The correct symmetry of the six-fold twin in β-Ca 11 B 2 Si 4 O 22