A comprehensive guide to rocks, minerals and gems written by geology experts
FLORENCE BULLOUGH works at The Geological Society of London. She has a lifelong interest in geology and has previously worked for the Natural History Museum in research. She has an MSci in Geology.
AMY BALL is an education officer at The Geological Society of London. She has previously worked at the Natural History Museum, and has worked with children to aid their scientific understanding.
ANNA ALANKO is a Helsinki-based freelance designer, illustrator and colour enthusiast.