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A fascinating encyclopedia and practical quick reference field guide for amateur geologists, enthustiasts, students as well as experienced geologists. Photographic directory illustrates 150 different types of rock. Expertly researched text on the key rock-forming environments of the world plus full advice on identifying rock types (photographic directory covers 150 different types of rock) and building a spectacular collection. Over 375 beautiful colour photographs. Includes glossary, index.