This is the ultimate photographic guide to the world of rocks and minerals. A comprehensive introduction explains the formation and classification of the many types of rock and mineral. Expertly written text describes the impact of factors such as time, weather and water erosion on external character. In the second part of the book specimens are grouped according to their chemical composition and characteristics, and all entries include quick-reference identification checklists to aid recognition. Featuring over 800 photographs and artworks, this is a one-stop reference, visual encyclopedia and field guide on a richly consuming and intriguing subject.