Glossary of Terms


Eight sided polyhedron; all sides are equidimensional and bisect at at the same angle. Minerals shaped as octahedrons belong to the isometric crystal system.
(Both octahedra and octahedrals are acceptable plural terms)

3D Animated Illustration of the Monoclinic System with Axes
Crystals kindly provided by Smorf


Magnetite Octahedron


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