Petrified Palm wood is well known in the U.S. It's the Texas state stone and the Louisiana state fossil. It comes from an extinct species of palm trees growing during the Oligocene Epoch of 20-40 million years ago. One of it's most noticeable features is the rod like structure in the grain of the wood. Depending on how the rock is cut, they will appear as polka dots, tapering rods, or lines as you can see on the front and sides of this specimen. At 7.5 hardness it's one of the harder minerals and takes a very nice polish.