Sue Fuller offers a large encyclopedia of minerals and rocks in a small and compact book. This book is 160 pages in total but is as big as my hand and is perfect for explorers, hikers, or rock enthusiasts to take out in the field. I love this little book. It is informational, accurate, and easy to use. Being a pocket-guide it is made to be accessible to anyone. I would highly recommend this book in particular because of the great images it has in it. These images make it especially easy to find the name and information on that rock or mineral that you have found! I would recommend this book to anyone.