My Top Geology Web Sites (Non-Commercial)
Mineral Collecting and Mineralogy
Research Institute
Optical Mineralogy
Teaching Resource, University of Southhampton
Mineral Database for Raman and X-ray Diffraction
Research into Earth and Planetary Sciences
NASA Introduction to Remote Sensing
Paleontology Online
Large Amount of Information and Data for Various Geology Disciplines
Lots of Reference Material on Volcanoes from the U. of California, Santa Barbara