External Links:
Amethyst Galleries' Mineral Gallery
Check out Mineral and Gemstone Knigdom
The U.S. Geological Survey has many on-line publications related to volcanism, rocks, and minerals.
The Indiana Geological Survey can give you some close to home geological info.
Here's a fairly comprehensive Mineralogy Database.
Do you like snowflakes? Check this site out at CalTech.
Back to the Physical Geology Home Page