GEOL 212: Physical and Optical Mineralogy
CRYSTALLOGRAPHY Crystal Morphology and Forms
Handout on Crystal Forms
Isometric Crystal Forms to Know
Hexagonal, Tetragonal, Orthorhombic, Monoclinic, and Triclinic Forms to Know
Read pages 24-37. Look at the drawings of the major forms and be sure you can recognize them. The main forms are listed on pages 26-28. Pay particular attention to the compound forms at the end of the chapter.
Read pages 36-38 about crystal habit. This is the general shape that crystals attain.
MINERALOGY TUTORITALS CD. In the Crystal Classes software, pay particular attention to the models and examples of real crystals given for each of the crystal classes. The animations are particularly good at showing the relationship of crystal axes and their relative angles to crystal forms.
THINGS TO KNOW:
Know what form and habit are. Be able to define and tell the difference.
Know the principle forms that are listed. Be able to identify them if given.
Be able to use the list of symmetry tips to place a form in the appropriate system.
Read the pages for each of the crystal systems (Isometric-Triclinic) paying particular attention to the forms and their relationship to crystallographic axes on the following web site.
Mike and Darcy Howard's Web Crystallography Course
Glance at the models of crystals on this page again and see if you can identify some of the forms.
Crystallography Web Page
If you have comments or suggestions, email me at email@example.com
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