This is an important specimen of Rayas acanthite for the notable crystal size and robust crystal habit. It is complete and pristine all around, actually a floater specimen. The hoppered, in-drawn faces add depth and visual interest to the normally more simple crystal habit of these acanthites. This is one of the largest single crystals, not in cluster, that I am aware of, for the locale. This is a crystal that can be stood vertically and exceeds 6 cm height, but set flat and still display as a large miniature. In person it has a bright and shiny luster, and is not "black." Ex University of Arizona collection, by donation in the past.