Based on a specimen from Amelia Mine, Boleo Dist., Baja California Sur, Mexico

This is one of the iconic shapes in mineralogy - highly symmetrical epitaxial overgrowths of cumengite over boleite. Although my specimen is tiny, its form is good, and finding it was all the encouragement I needed to get started on a model. This was the first model I attempted with nonconvex regions, and I was surprised by how well it worked out. Gluing these models together accurately is difficult, and sanding inside the concave areas is worse yet. But some of the most interesting crystals out there have concave areas, so developing a technique to represent them was clearly necessary!