San Diego Natural History Museum
San Diego Natural History Museum: Mineral Matters: Grow Your Own Crystals
Here are step-by-step instructions on how to create crystals. This is a great experiment for students to use in learning about the structure and formation of crystals.
Other
New Dana System Mineralogy Database
Over 3,900 mineral species descriptions are included in this HTML-linked table of Dana classifications for all known valid mineral species. 3-D models are available for over 600 minerals.