Isometric (or Cubic) System
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Three axes of symmetry, all at right angles to one another and all of equal length.
Crystals are generally blocky in appearance or ball-like, with many similar, symmetrical faces; characteristic forms are cubes, octahedrons, and dodecahedrons, either single or in varied combinations. Also called the cubic crystal system. Chesterman, pp. 33-34
Sources
- Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987)