Extensive information on minerals with an emphasis on crystallography is provided by the Athena project at the University of Geneva, Switzerland and by the Mineralogy Database of David Bartehelmy. The Minerals Spectroscopy Server maintained by George Rossman at CalTech is a valuable collection of spectroscopic data on minerals. Visible, infrared, and Raman spectra are provided. Materials By Design site at Cornell University is a comprehensive tutorial on dedicated to properties the characterization, structure, and properties of materials and the applications of these materials, e.g. the construction of golf clubs. A Navy site at the Naval Research Lab provides a useful set of crystal lattice structures.
Nanotechnology is an emerging field of materials science.
The TecNANO page maintained by the Institute for Molecular Manufacturing. The Xerox page which has information about molecular nanotechnology and links to on-line articles. The NASA site which has images and movies on molecular machines. Also check out a second site maintained by NASA Ames. Several metals are used in the construction of bicycles and the Bikepro site is a useful source of information on their properties.