Minerals, Metals, and Other Materials

Rocks and Minerals

What are Indian Dollars?

They are six-sided, disk-shaped, twin crystals of aragonite (CaCO3), which have altered to calcite but retained their outer form. They occur in large numbers in northern Colorado, where they are known as “Indian Dollars.” In New Mexico they are called “Aztec Money” and in western Kansas they are called “Pioneer Dollars.”


This is a web preview of the "The Handy Science Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App