Turitella agate.. This stuff is just plain cool. What's on offer here is excellent quality and a good size at a very fair price. The specemin I received is beautiful and loaded with snail fossils. I will most definitely be making a pendant out of this. It's also one of the most fascinating stones to look at under a loupe, I can get lost in this for hours! Highly recommended for lapidary and rockhound alike!