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WebElements is a comprehensive online periodic table database located in South Yorkshire, England at the University of Sheffield. The site also contains geology-specific data for the elements. There are numerous mirror sites for WebElements around the world. One such mirror site is at the University of California, Berkeley.
CHEMystery's Atoms and Molecules page covers atomic theory, molecular compounds, and ionic compounds.
The Mineral and Gemstone Kingdom provides an interactive, educational guide to minerals and gemstones. Includes mineral images.
The Mineral Structures Database includes crystallographic and physical property data for most of the rock-forming minerals.
The Mineral Gallery has lots of information and quality photographs of outstanding mineral samples.