Useful Software & Other Links
This site is the holy grail of rock & mineral identification info. Each page consists of two parts, descriptive (an exhaustive explanation of the mineral phase) and visual (high-resolution photographs); the information contained on the pages are taken from various university textbooks and scientific papers, cited throughout the text.
Lots & lots of maps from geomagnetic anomalies to earthquake depths to extraterrestrial geology. You'll need an updated version of Java installed on your computer for the software to work.