Pseudochroism in twinned plates of calcite

Abstract

The well-known, frequently observed phenomenon of coloration of twinned plates that grow through calcite grains along the planes of the first most obtuse rhombohedron (1012) also belongs to the category of pseudochromism phenomena. In this case, the pseudochromism phenomenon is often very striking, and for this reason, as well as because the position of the twinned plates is here easily determined, the phenomenon can be more readily subjected to investigation. This work represents an attempt at such an investigation. The application of the "universal" method to the study greatly supplements the picture of the phenomenon and makes it possible to answer some of the questions it raises. Therefore, I venture to publish the obtained results despite being aware of the incompleteness in the elucidation of the issue.

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