This book is very complete, written in an intelligent and graceful style, and logically indexed for ease of use. Mr. Gienger presents a well balanced mix of minerology, mythology and spiritual/healing properties for more than 90 crystals and gemstones, ranging from the formation of crystals to suggestions for various healing uses. The outstanding crystal photographs are themselves worth the price of the book. It's not only a wonderful reference book, it's a great read. The section on "Discovering the connection between crystalline structures and lifestyles" is fascinating and unique. Without question, this is the one book on crystals that I will use most often.