Usborne Spotter's Guides Rocks Minerals Author:Alan Woolley Learn to identify over 85 different rocks and minerals! Diamonds, rubies, crystals, limestone and more! What are they made of? How do they form? Where can they be found? Find the answers to all your questions in Rocks and Minerals! You can lern to spot these precious rocks and minerals in your local museum, near beaches or even in your own... more » backyard! Helpful hints allow you to start your own collection that you will treasure for a lifetime.« less