"Agates: Treasures of the Earth" is an indispensable resource for all those fascinated by agates, from amateur collectors to gemmologists. Agate collectors worldwide are drawn to its infinite variety of colourations and banding. This book captures that enthusiasm and reveals how and where agates form, together with a comprehensive identification guide. It is both an up-to-date reference source and an accessible introduction to the life of agates. It is beautifully illustrated with full colour photographs of superb mineral specimens from around the world.