Difference between revisions of "Hexagonal system"
Jump to navigation
Jump to search
(removed trigonal) |
m (Reverted edits by NJrepublican (Talk) to last revision by BrianCo) |
| (One intermediate revision by one other user not shown) | |
(No difference)
| |
Latest revision as of 14:40, June 22, 2010
The hexagonal crystal system has four axes of symmetry: three, of equal length, lie in a plane at 120°; the fourth axis is longer or shorter and is at right angles to the others.
Crystals are generally prismatic or columnar, with an hexagonal cross section; characteristic forms are six-sided prisms. The similar trigonal system (or rhombohedral) is often included within the hexagonal system.
Sources
- Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987), pp. 33-34