Triclinic System

Three axes, all of different length and none perpendicular to the others.

Crystals are usually flattened, with sharp edges and sharp, thin cross section; no right angles on faces or edges; all forms are 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)