This descriptive catalogue is a must-have for any serious geologist or rock collector. It provides detailed information on the rock specimens in the prestigious Museum of Practical Geology in Great Britain, including their nature and mode of occurrence in place. The explanations are clear and accessible, making this book suitable for both professionals and amateurs alike. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.