Twin"ning(?), n. (Crystallog.) The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about.
Polysynthetic twinning, repeated twinning of crystal lamell, as that of the triclinic feldspars. --
Repeated twinning, twinning of more than two crystals, or parts of crystals. --
Twinning plane. See the Note under Twin,
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Tue 11th December 2018