This book on crystals gives the reader more information than many introductory books.  Starting with how crystals are formed from minerals, this potentially complex subject is presented in a very readable format.  A variety of crystals are mentioned.  One learns how crystal shapes are formed by their facets, how crystals grow, where they can be found in nature, and how people use them.  The reader is encouraged to view websites, critique short articles, do experiments, reflect on what they know about crystals and defend their opinions.  Glossary, index, bibliography, and websites are included.  This book goes a step further than most resources by providing opportunities for the reader to contemplate, analyze, and/or appraise given information.