Abstract
The widths of just under 7000 Albite and Pericline lamellae were measured in a suite of 20 polysynthetically twinned anorthoclase megacrysts collected at two sites in New Mexico. The majority of the twins were formed during the inversion of the anorthoclase crystals from their high-temperature monoclinic modification to their present triclinic form. Textural evidence suggests that a few of the lamellae postdate the transformation and are mechanical in origin. Twin density is exceedingly inhomogeneous on all scales and the related black and white lamella sets are unequally developed within even a single crystal. This type of inhomogeneity is probably a common feature of all inversion twinning since it arises as a natural consequence of the complex and rapidly changing conditions within a crystal undergoing transformation.
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