Crystallography 101  
   Basic tutorial.
   http://www-structure.llnl.gov/Xray/101index.html

Principles of Protein Structure '96  
   Index to course material.
   http://www.cryst.bbk.ac.uk/PPS2/course/index.html

Interactive Tutorial about Diffraction  
   A pictoral guide to using these techniques especially for working out structural information, largely through the use of illustrative examples.
   http://www.uni-wuerzburg.de/mineralogie/crystal/teaching/teaching.html

Crystallography and Minerals  
   Crystallography groups in mineralogy are composed of 32 classes of symmetry. To illustrate these symmetry elements, example crystalline forms for each symmetry class are represented by a JAVA applet.
   http://web.wt.net/~daba/Mineral/crystall.html

Snow Crystals  
   Information about the physics of snow crystals and snowflakes as well as the history of early scientific observations and photographs, how to take photos, preserving snow crystals, and unusual snowflakes.
   http://www.its.caltech.edu/~atomic/snowcrystals/

Introduction to Cubic Crystal Lattices  
   A site introducing the properties of crystals with a cubic unit cell.
   http://www.okstate.edu/jgelder/solstate.html

Crystallization in Foods  
   Contains the latest information on how and why crystals form in foods, and how this information can be used to control crystallization. General organization of Crystallization in Foods is set according to the steps that occur during crystallization.
   http://www.chipsbooks.com/crysfood.htm

Structures of simple inorganic solids  
   An overview of important crystal structures.
   http://www.chem.ox.ac.uk/icl/heyes/structure_of_solids/Strucsol.html

SDPD Internet Course  
   Commercial e-learning course teaching how to determine a crystal structure from powder diffraction data.
   http://www.cristal.org/course/

Knowhere  
   Lesson on the geometry and symmetry of elements and minerals using Polymorf, a new math and science manipulative. The topological approach is used to characterize the structure of crystals in terms of linked polyhedra.
   http://www.polymorf.net/knowhere.htm

Difference Patterson Tutorial  
   A step-by-step guide to solving these problems based on the use of an example.
   http://www.dartmouth.edu/~brenner/pr613.html

MSU Chemistry: Crystallography Service  
   Explains crystallography procedures and is primarily intended for internal users of their analysis facilities, as well as a reference for students carrying out the work.
   http://www.cem.msu.edu/~ward/crys_serv.html

Xtal-protocols  
   Manual with information about (membrane) protein crystallization for X-ray crystallography.
   http://www.xtal-protocols.de

Kevin Cowtan's Picture Book of Fourier Transforms  
   For future crystallographers.
   http://www.ysbl.york.ac.uk/~cowtan/fourier/fourier.html