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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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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.
Petrogenesis of Plio-Pleistocene volcanic rocks from the Chagai arc, Balochistan, Pakistan

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