UMass presents more than 4,000 online courses yearly to help our college students continue their education, enhance their careers, and enrich their lives regardless of the place they’re positioned. With 200+ levels and certificates now available online, UMass is proud to be helping busy professionals, lifelong learners, and college students worldwide. This morphology was used in all the crystal groups and lessons for drawing the examples and the stereo pictures. The larger order varieties have been chosen to best illustrate a few of the subtle differences within the symmetry classes. Remember, most real crystals will probably not have related types when compared to the examples. Crystal Groups and Classes – Crystallography teams are composed of 32 lessons of symmetry derived from observations of the exterior crystal kind.