BK18 Rocks and Minerals – Smithsonian Hand Books by Chris Pellant –  This book combines 600 vivid color photos with descriptions of more than 500 specimens to highlight the chief characteristics of the rock or mineral and it’s distinquishing features.  Designed for beginners and experienced collectors alike, the Smithsonian Handbook explains what rocks or minerals are, how they are classified and how to start a collection.  To help in the initial stages of rock identification, a clear visual key illustrates the differences between igneous, metamorphic and sedimentary rocks, then guides the reader to the correct rock entry. A concise glossary provides instant understanding of technical and scientific terms.