Orthorhombic system

The orthorhombic crystal system has three unequal axes, all at right angles to one another.

Crystals are generally short, stubby, with a diamond-shaped or rectangular cross section; characteristic forms are four-sided prisms, pyramids, and pinacoids (open forms made up of two parallel faces).

## Sources[edit]

* Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987), pp. 33-34