What is a cube in mineralogy ?

Cube : definition

A cube is a closed polyhedron (hexahedron) whose six faces are square and equal and which has twelve edges of the same length. All angles are equal to 90°. It is the basic form of the cubic system, from which all the others are derived by truncations and combinations. Pyrite (photo on the right), fluorite, galenahalite or boleite are mineral species often crystallizing in the form of cubes.

Pattern to print and cut in the section "our crystallographic models".