Orthorhombic System
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Three unequal axes, all at right angles to one another.
Crystals are generally short, stubby, with diamond-shaped or rectangular cross section; characteristics forms are four-sided prisms, pyramids, and pinacoids (open forms made up of two parallel faces). 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)