Crystals can be divided into several crystal classes based on the geometrical arrangement of their component atoms and polyatomic ions. This model, a dipyramid, is an example of the Isometric crystal class where all axes of the crystal have identical dimensions.
Fluorite (CaF2) is a common mineral with this crystal structure.
This is the first 3D scan from Iowa State University's GeoFabLab! Made by Artur Pacyga and Dr. Franek Hasiuk. Scanned with the MakerBot Digitizer Desktop 3D Scanner.