Could topaz protect you if you wore it? The Ancient Greeks and Egyptians thought so! Ancient people also believed a topaz would change color when near a poisoned food or drink. In this book presented by Scientific American, readers learn about the stories surrounding topaz, as well as the facts behind its formation in igneous rocks. Beautiful full-color photographs and fun fact boxes enhance the understandable text. The main content supports knowledge building, a key component of the science of reading.