polysynthetic twinning


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polysynthetic twinning

[¦päl·i·sin′thed·ik ′twin·iŋ]
(crystallography)
Repeated twinning that involves three or more individual crystals according to the same twin law and on parallel twin planes.
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It occurs as large euhedral prismatic grains and polygonal basal sections, occasionally showing polysynthetic twinning (Fig.
Plagioclase: Plagioclase crystals are euhedral to subhedral, lathlike, columnar and equant in shape and exhibit polysynthetic twinning according to the albite and occasionally to the combined albite and Carlsbad laws.