Gov. Bobby Jindal has blessed a plan to create a new state gemstone, the cabochon cut gemstone derived from a special Louisiana-grown oyster -- the Crassostrea virginica mollusk. View full sizeDavid ...

Minnesota's Lake Superior hides a volcanic past, where ancient eruptions left stunning agates that sparkle with history.

Sisters Jessica Sander and Jen Majkrzak look for agates in a Carlton County gravel pit. Their dad was an avid agate collector whose home is filled with vases, and even a lamp, of agates. He took ...

THIS exquisite image captures the astonishing internal structure of crazy lace agate, also known as Mexican agate. This section of the mineral is some 65 million years old. Agate is related to quartz ...