
The amethyst has been a desirable gem for thousands of years. Today, the purple stones are mined all over the world and set into brilliant jewelry. Readers learn the geologic process that creates an amethyst as well as how the presence of iron or manganese may contribute to its...

The amethyst has been a desirable gem for thousands of years. Today, the purple stones are mined all over the world and set into brilliant jewelry. Readers learn the geologic process that creates an amethyst as well as how the presence of iron or manganese may contribute to its...