Hi Paul, thanks for the extra pics which I also agree confirm this is rock crystal, and very nicely carved as well. I have some semi precious and quartz crystal carvings in my crystal collection, but yours is one of the nicest I have seen.
If you copy and paste to this eBay link in Google,and click on it, you will see many other quartz crystal carvings... but just don't scroll down too far!!
Excellent Natural Quartz Rock crystal Rabbit Carving | eBay
It is the first listing on the page.