Wikimedia
Wikipedia: Hornblende
Wikipedia offers a description of the mineral Hornblende including specific gravity, hardness, and image.
Other
Rockhounding Arkansas: Basic Mineral Identification
Want to learn about rock collecting? This page introduces you to the basics and language of rocks and -inerals. Learn what the difference is between a rock and a mineral.
Math Science Nucleus
I. Science Ma Te: Integrating Science, Math and Technology
This site offers a wealth of online textbook-related materials that encourage the discovery of science in the world around us. Enter the site to access material on specific topics. Each section contains reading material (complete with...