Based on a specimen from Joplin, MO

The calcite crystal this model is based on has an attractive combination of forms, with the added bonus of a sharp orange phantom inside. On the surface, the faces of the rhombohedron {02.1} bevel the edges of the scalenohedron {21.1}, while the phantom appears to be the scalenohedron alone. This model shows only the surface forms, although I am contemplating the future construction of a glass or plexiglass model with a visible phantom model suspended inside.