Last Updated
：2025/11/20
polysynthetic twinning
（ plural ）
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(geology) A type of contact twinning, typically observed in plagioclase, in which the composition surfaces are parallel to one another
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polysynthetic twinning
Under the microscope, the feldspar sample exhibited classic polysynthetic twinning, with repeated thin lamellae aligned parallel to the composition surfaces.
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Under the microscope, the feldspar sample exhibited classic polysynthetic twinning, with repeated thin lamellae aligned parallel to the composition surfaces.
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