How hard is a diamond? What is the difference between granites and garnets? Minerals are the building blocks of rocks. They are inorganic, crystalline solids with a known chemistry. Examples of ...

What's not to like about mineral specimens? They sparkle. They come in deep, beautiful colors and strange, fabulous crystalline formations--many so perfectly formed you'd swear they'd been cut by a ...

Like many abandoned mines, the Eureka uranium mine in northern Spain is a maze of long, dank tunnels. Water seeping down the walls carries dissolved substances that percolated through rocks overhead.

Minerals aren’t just in rocks—they’re in your house, your food, even your body! From aluminum cans to toothpaste, and calcium to iron, discover how minerals shape the world around us and why they’re ...