This is very simply, a huge, well formed, rhomb of lustrous and translucent, calcite that has been RICHLY included by fibrous, richly colored blue aurichalcite. A minor contact on the back side is unimportant when compared to this crystal and its color, and its perfection on the display faces. Wow! For a single, impressive blue rhomb, this will definitely stand out upon any shelf. There is, I think, nothing quite like these in the mineral world.