CoachA twin is an intergrowth of two or more crystals of the same mineral whose lattices are related by a symmetry that the crystal itself does not have, such as a reflection across a plane (the twin plane). Polysynthetic twinning is repeated twinning on parallel planes, which divides a crystal into thin parallel lamellae whose orientations alternate.
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Earth and Space Sciences · 术语表
什么是 Twin, polysynthetic twinning？
又称： twin (crystal) · polysynthetic twinning
