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.
Wikimedia
Wikipedia: Topaz
This encyclopedia article from Wikipedia provides a general overview of the gemstone topaz. Liinks are provided for additional information on related subjects.