Scholastic
Scholastic: Study Jams! Science: Landforms, Rocks & Minerals: Minerals
A slideshow and a short multiple-choice quiz on the topic of minerals and how to identify them by their properties.
Amethyst Galleries
Amethyst Galleries: Mineral Gallery: What Is Streak?
Streak is the color of the powder of a mineral. This page discusses the importance of streak when identifying minerals.