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Lastly, ssss1 explores ores minerals, industrial minerals, and gems as well as environmental and health issues related to Earth materials.

In addition to information presented in this textbook, additional resources, including detailed descriptions of major rock‐forming minerals and keys for identifying minerals using macroscopic and/or optical methods are available on the website that supports this text at:

www.wiley.com/go/hefferan/earthmaterials.

Our overall goal is to produce an innovative, visually appealing, informative, and readable textbook that addresses the full spectrum of Earth materials. We present equal treatment to minerals as well as igneous, sedimentary, and metamorphic rocks and demonstrate their impact on our personal lives and the global environment on this planet. We hope you enjoy this text and use it to further your knowledge of Earth materials.

The authors thank all those at John Wiley & Sons who worked with them on the second edition. Special thanks are due Rosie Hayden, Antony Samy, Anandan Bommen, Umar Saleem and Andrew Harrison. Their first edition greatly benefited from guidance provided by Ian Francis, Kelvin Matthews, Jane Andrews, Delia Sandford, Camille Poire, Catherine Flack and, once again, Rosie Hayden. The authors are grateful to Anita O’Brien who provided the index for both editions. We once again thank reviewers for the first edition who greatly improved the textbook, while in no way being responsible for its shortcomings. These individuals include Malcolm Hill, Stephen Nelson, Lucian Platt, Steve Dutch, Duncan Heron, Jeremy Inglis, Maria Luisa Crawford, Barbara Cooper, Alec Winters, David H. Eggler, Cin‐Ty Lee, Samantha Kaplan, Penelope Morton and Ellen D’Andrea.