rotation twin
noun
: a twin crystal in which the individuals are so related that one can be made to coincide with the other by a rotation of 180 degrees or occasionally 60, 90, or 120 degrees compare reflection twin
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“Rotation twin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rotation%20twin. Accessed 30 Nov. 2024.
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