The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
Online ISSN : 1883-0765
Print ISSN : 0021-4825
ISSN-L : 0021-4825
CLASSIFICATION OF TWINS IV. ORDINARY TWINS
YUKIO TAKANO
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1972 Volume 67 Issue 10 Pages 345-351

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Abstract

28 twin point groups of ordinary twins are assigned to the respective crystal systems of twinning, using the notations of Hermann-Mauguin and Schönflies.
Ordinary twins are classified into six types by the kind and number of the twining planes; namely, A. Interpenetration, B. Double cross twin, E. Biaxial cyclic contact twin, and F. Biaxial contact twin. The first four types are collectively called thepenetration twin, and the last two the contact twin.

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