Crystal Healing

I have a druzy quartz geode that's about the size of my hand. I know druzy geodes are fairly common, but what about geodes that look like an animal skull? This thing has eyes, a nose, and what looks like a ridge where the lower jaw/teeth should be (no lower jaw). At the back, it even has a dent where the spine of an animal would attach to the skull. There's a hole in the top, and when you look through the hole, you find all the crystals and can look out through the "eye holes," lol. It looks like a petrified turtle skull. How common are fossil shaped geodes, and what are they worth?