pericline twin law

pericline twin law

[′per·ə‚klīn ′twin ‚lȯ]
(crystallography)
A parallel twin law in triclinic feldspars, in which the b axis is the twinning axis and the composition surface is a rhombic section.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.