
A chunk of granite rock may look gray and boring, but take a closer look under a microscope and it's possible to see that the rock is made from billions of tiny colorful grains. Each microscopic grain is a substance called a mineral, and it's minerals that are the ingredients...

A chunk of granite rock may look gray and boring, but take a closer look under a microscope and it's possible to see that the rock is made from billions of tiny colorful grains. Each microscopic grain is a substance called a mineral, and it's minerals that are the ingredients...