Tiniest Treasures #4: Agate

This is the fourth installment in a series we call:

THE SMALLEST CONTINUOUSLY ROTATING EXHIBIT OF MOTHER NATURE'S TINIEST TREASURES

The tiny treasure pictured here is an agate.

Fun Fact: Agates are pieces of silica that formed inside ancient rocks or shells millions of years ago. They come in a variety of colors, including lavender and black.